question

At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the 2) magnetic field due to the wire equal to the strength of Earth's magnetic field of about 5.0 × 10-5 T? ( μ0 = 4 × 10-7 T · m/A)

answer

C) 2.0 cm

question

A proton moving eastward with a velocity of 5.0 km/s enters a magnetic field of 0.20 T pointing 3) northward. What are the magnitude and direction of the force that the magnetic field exerts on the proton? (e = 1.60 × 10-19 C)

answer

D) 1.6 × 10-16 N upwards

question

If a calculated quantity has units of T · m/A, that quantity could be

answer

D) μ0.

question

A wire lying in the plane of the page carries a current toward the bottom of the page, as shown in 5) the figure. What is the direction of the magnetic force it produces on an electron that is moving to the left directly toward the wire, as shown?

answer

A) directly toward the bottom of the page

question

In a certain velocity selector consisting of perpendicular electric and magnetic fields, the charged 11) particles move toward the east, and the magnetic field is directed to the north. What direction should the electric field point?

answer

B) downward

question

If you were to cut a small permanent bar magnet in half,

answer

A) each piece would in itself be a smaller bar magnet with both north and south poles.

question

A charged particle moves with a constant speed through a region where a uniform magnetic field is 14) present. If the magnetic field points straight upward, the magnetic force acting on this particle will be strongest when the particle moves

answer

D) in a plane parallel to Earth's surface.

question

An electron is moving to the right, as shown in the figure. Suddenly it encounters uniform 16) magnetic field pointing out of the page. Which one of the three paths shown will it follow in the field?

answer

A) path a

question

At a particular instant, a proton moves toward the east in a uniform magnetic field that is directed 17) straight downward. The magnetic force that acts on it is

answer

E) toward the north.

question

A proton has an initial velocity to the south but is observed to curve upward as the result of a 18) magnetic field. This magnetic field must have a component

answer

A) to the east.

question

A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing 21) from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section DE of this wire?

answer

E) 0.12 N perpendicular into the page

question

) A long, straight wire carrying a current is placed along the y-axis. If the direction of the current is 22) in the +y direction, what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you?

answer

C) counterclockwise, around the y-axis

question

Which one of the following statements is correct?

answer

B) The north pole of a magnet points towards Earth's geographic north pole.

question

When the switch is closed in the circuit shown in the figure, the wire between the poles of the 25) horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is

answer

A) a south magnetic pole.

question

An electron moving in the +y direction, at right angles to a magnetic field, experiences a magnetic 26) force in the -x direction. The direction of the magnetic field is in the

answer

A) +z direction.

question

An electron has an initial velocity to the south but is observed to curve upward as the result of a 29) magnetic field. This magnetic field must have a component

answer

C) to the west.

question

A horizontal wire carries a current straight toward you. From your point of view, the magnetic 33) field caused by this current

answer

D) circles the wire in a counter-clockwise direction.

question

A rigid rectangular loop, measuring 0.30 m by 0.40 m, carries a current of 9.9 A, as shown in the 34) figure. A uniform external magnetic field of magnitude 1.8 T in the -x direction is present. Segment CD is in the xz-plane and forms a 19° angle with the z-axis, as shown. What is the y component of the magnetic force on segment AB of the loop?

answer

B) +5.1N

question

) A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the 35) +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

answer

C) The particle could be either positive or negative.

question

Which one of the following statements is correct

answer

A) When a current-carrying wire is in your right hand, with your thumb in the direction of the current, your fingers point in the direction of the magnetic field lines.

question

wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing 38) from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.65 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section BC of this wire?

answer

A) 0 N

question

An ideal solenoid is wound with 470 turns on a wooden form that is 4.0 cm in diameter and 50 cm 43) long. The windings carry a current in the sense shown in the figure. The current produces a magnetic field of magnitude 4.1 mT, at the center of the solenoid. What is the current I in the solenoid windings? (μ0 = 4 × 10-7 T · m/A)

answer

E) 3.5A

question

A wire lying in the plane of this page carries a current directly toward the top of the page. What is 44) the direction of the magnetic force this current produces on an electron that is moving perpendicular to the page and outward from it on the left side of the wire?

answer

E) The force is zero.

question

46) Three very long, straight, parallel wires each carry currents of 4.0 A, directed out of the page as 46) shown in the figure. These wires pass through the vertices of a right isosceles triangle as shown. Assume that all the quantities shown in the figure are accurate to two significant figures. What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle? ( μ0 = 4 × 10-7 T · m/A)

answer

E) 57 μT

question

Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is 48) doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?

answer

A) It stays the same.

question

A ring with a clockwise current (as viewed from above the ring) is situated with its center directly 54) above another ring, which has a counter-clockwise current, as shown in the figure. In what direction is the net magnetic force exerted on the top ring due to the bottom ring?

answer

A) upward

question

A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the 55) poles of a magnet, as shown in the figure If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section AB of this coil?

answer

C) perpendicular to and into the page

question

) At a particular instant, an electron moves toward the east in a uniform magnetic field that is 56) directed straight downward. The magnetic force that acts on it is

answer

A) toward the south.

question

A positive charge is moving to the right and experiences an upward magnetic force, as shown in 57) the figure. In which direction must the magnetic field have a component?

answer

C) into the page

question

A wire is carrying current vertically downward. What is the direction of the force on this wire due 58) to Earth's magnetic field?

answer

C) horizontally towards the east

question

A long, straight, horizontal wire carries current toward the east. A proton moves toward the east 61) alongside and just south of the wire. What is the direction of the magnetic force on the proton?

answer

C) toward the north

question

A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing 72) from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.55 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section CD of this wire?

answer

B) 0.066 N perpendicular out of the page

question

A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. 73) We may conclude that the magnetic field must have a component

answer

C) towards the east.

question

77) When a ferromagnetic material is placed in an external magnetic field, the net magnetic field of its 77) magnetic domains becomes

answer

A) larger.

question

Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction?

answer

B) toward the southwest

question

A proton, moving east, enters a magnetic field. Because of this magnetic field the proton curves 80) downward. We may conclude that the magnetic field must have a component

answer

D) towards the south.

question

A negatively-charged particle moves across a constant uniform magnetic field that is 84) perpendicular to the velocity of the particle. The magnetic force on this particle

answer

A) causes the particle to accelerate.

question

85) Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in 85) the same direction,

answer

C) the wires pull toward each other.

question

86) A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the 86) poles of a magnet, as shown in the figure If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section BC of this coil?

answer

E) The force is zero.

question

The direction of the force on a current-carrying wire in a magnetic field is

answer

B) perpendicular to both the current and the magnetic field.

question

A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing 89) from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the net force acting on this wire?

answer

C) 0.10 N perpendicular out of the page

question

A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves 90) upward. We may conclude that the magnetic field must have a component

answer

C) towards the south.

question

3) For the horseshoe magnet shown in the figure, the left end is a north magnetic pole and the right 93) end is a south magnetic pole. When the switch is closed in the circuit, which way will the wire between the poles of the horseshoe magnet initially deflect?

answer

B) downward

question

A vertical wire carries a current vertically downward. To the east of this wire, the magnetic field 94) points

answer

D) south.

question

The figure shows a velocity selector that can be used to measure the speed of a charged particle. A 101) beam of particles of charge +q is directed along the axis of the instrument. A parallel plate capacitor sets up an electric field E which is oriented perpendicular to a uniform magnetic field B. If the plates are separated by 3.0 mm and the value of the magnetic field is 0.30 T, what potential difference between the plates will allow particles of speed v = 5.0 × 105 m/s to pass straight through without deflection?

answer

A) 450V

question

Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A 104) current I is flowing through the wire windings. If the length of the solenoid becomes twice as long (to 2L), but all other quantities remained the same, the magnetic field inside the solenoid will

answer

D) become one-half as strong as initially.

question

109) A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the 109) +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity. What is the direction of the electric field?

answer

C) along the +y-axis

question

A vertical wire carries a current straight up in a region where the magnetic field vector points 112) toward the north. What is the direction of the magnetic force on this wire?

answer

D) toward the west

question

A charged particle that is moving in a static uniform magnetic field

answer

D) may experience a magnetic force, but its speed will not change.

question

Two long, parallel wires carry currents of different magnitudes. If the amount of current in one of 114) the wires is doubled, what happens to the magnitude of the force that each wire exerts on the other?

answer

B) It is increased by a factor of 2.

question

A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary 115) centripetal force. In what direction should the proton move?

answer

E) westward

question

119) A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure. What 119) is the direction of the magnetic field at a point P due to this wire?

answer

C) out of the plane of the page

question

An electron, moving south, enters a magnetic field. Because of this field, the electron curves 121) upward. We may conclude that the magnetic field must have a component .

answer

D) towards the west.

question

An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. 122) We may conclude that the magnetic field must have a component

answer

D) towards the north.

question

A long, straight, horizontal wire carries current toward the east. An electron moves toward the east 123) alongside and just south of the wire. What is the direction of the magnetic force on the electron?

answer

D) toward the south

question

Three particles travel through a region of space where the magnetic field is out of the page, as 124) shown in the figure. What are the signs of the charges of these three particles?

answer

C) 1 is negative, 2 is neutral, and 3 is positive.

question

A negatively charged particle -Q is moving to the right, directly above a wire having a current I 125) flowing to the right, as shown in the figure. In what direction is the magnetic force exerted on the particle due to the current?

answer

C) upward

question

Two long parallel wires placed side-by-side on a horizontal table carry identical current straight 129) toward you. From your point of view, the magnetic field at a point exactly between the two wires

answer

C) is zero.

question

The magnetic force on a current-carrying wire in a magnetic field is the strongest when

answer

E) the current is perpendicular to the magnetic field lines.

question

A charged particle is injected into a uniform magnetic field such that its velocity vector is 133) perpendicular to the magnetic field lines. Ignoring the particle's weight, the particle will

answer

C) follow a circular path.

question

Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in 141) opposite directions. The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you. From your point of view, the magnetic field at a point exactly midway between the two wires

answer

E) points downward.

question

A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing 142) from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section AB of this wire?

answer

A) 0.11 N perpendicular out of the page

question

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in 143) opposite directions,

answer

D) the wires push away from each other.

question

If a calculated quantity has units of N · s , that quantity could be

answer

B) a magnetic field.

question

We observe that a moving charged particle experiences no magnetic force. From this we can 146) definitely conclude that

answer

D) either no magnetic field exists or the particle is moving parallel to the field.

question

A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the 147) poles of a magnet, as shown in the figure. If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section CD of this coil?

answer

B) perpendicular to and out of the page

question

) An electron moving along the +x-axis enters a magnetic field. If the electron experiences a 148) magnetic deflection in the -y direction, then the magnetic field must have a component

answer

D) along the -z-axis

question

An object is hung using a metal spring. If now a current is passed through the spring, what will 152) happen to this system?

answer

D) The spring will contract, raising the weight.

question

The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is 156) the magnetic field at a distance of 1 cm from this wire?

answer

A) 8 μT

question

A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on 157) the left. If you cut the magnet in half, the right half will

answer

A) contain a north pole on the right and a south pole on the left.

chapter 20 7th edition conceptual questions

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