Chapter 27 Physics
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At the instant the positively charged body is at the origin, the magnetic field at point P due to the motion of this charged body is in the negative x-direction. The charged body must be moving
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in the positive z-direction.
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At the instant the negatively charged body is at the origin, the magnetic field at point P due to the motion of this charged body is in the negative x-direction. The charged body must be moving
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in the negative z-direction.
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Two positively charged bodies are moving in opposite directions on parallel paths that lie in the x-z plane. Their speeds are equal and their trajectories are equidistant from the x-axis. The magnetic field at the origin, due to the motion of these charged bodies will be
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in the y-direction.
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Two wires lying in the plane of this page carry equal currents in opposite directions, as shown. At a point midway between the wires, the magnetic field is
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into the page
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What is the direction of the magnetic field around a wire carrying a current perpendicularly into this page?
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It is clockwise around the wire in the plane of the page.
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A wire carries an electric current straight upward. What is the direction of the magnetic field due to the current north of the wire?
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west
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Two current-carrying wires are perpendicular to each other. The current in one flows vertically upward and the current in the other flows horizontally toward the east. The horizontal wire is 1 m south of the vertical wire. What is the direction of the net magnetic force on the horizontal wire?
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There is no net magnetic force on the horizontal wire.
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A solenoid carries a current I. An electron is injected with its velocity vector along the axis AB of the solenoid. When the electron is at C, it experiences a force that is
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zero
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In a circular loop of wire lying on a horizontal floor, the current is constant and, to a person looking downward, has a clockwise direction. The accompanying magnetic field at the center of the circle is directed
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vertically downward.
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The current in a wire along the x-axis flows in the positive x-direction. If a proton, located as shown in the figure above, has an initial velocity in the positive z-direction, it experiences
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no force
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which one of the following statements concerning the magnetic field well inside a long, current-carrying solenoid is true?
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The magnetic field is non-zero and nearly uniform.
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Complete the following statement: The magnetic field around a current-carrying, circular loop is most like that of
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a short bar magnet.
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Two wires lie parallel in the plane of the paper and carry equal currents in opposite directions.
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out of the page.
