Objective #15

question

DC motors are fairly simple and inexpensive to make. True False
answer

True
question

The field(s) surrounding every moving neutron is(are) always magnetic but never electric. always electric but never magnetic. sometimes magnetic and sometimes electric. always both electric and magnetic. none of the above
answer

none of the above
question

If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil at half the speed, one half as much voltage is induced. the same voltage is induced. twice as much voltage is induced. four times as much voltage is induced. none of these
answer

one half as much voltage is induced.
question

The reason a magnet can pick up an unmagnetized steel paper clip is that paper clips are actually magnetic. the magnet temporarily magnetizes the paper clip. electrons in the paper clip are attracted to the magnet. protons in the paper clip are attracted to the magnet.
answer

the magnet temporarily magnetizes the paper clip.
question

If the north pole of a magnet is thrust into a closed loop of wire and produces a positive current, then when it is pulled back out of the loop the current will be also positive. negative. no current produced when it leaves the loop.
answer

negative.
question

A device that transforms mechanical energy into electrical energy is a generator. motor. transformer. magnet. none of these
answer

generator.
question

A device that transforms electrical energy to mechanical energy is a generator. motor. transformer. magnet. none of these
answer

motor.
question

Which scientist discovered the process known as electromagnetic induction? Michael Faraday Ben Franklin Thomas Edison Hans Christian Oersted Allesandro Volta Andre Marie Ampere
answer

Michael Faraday
question

An electromagnet is made by wrapping insulated wire around a steel nail and connecting the wire ends to a dry cell battery. If you want this electromagnet to reverse its north and south poles, then you should reverse the current flow. wrap the nail the opposite way. reverse the current flow AND wrap the nail the opposite way. reverse the current flow OR wrap the nail the opposite way, but not do both. point the nail in the opposite direction.
answer

reverse the current flow OR wrap the nail the opposite way, but not do both.
question

Oil and coal power plants produce electricity because burning the oil and coal produces electrically charged particles. current in a wire. chemical changes that produce current. tremendous amounts of heat. radioactive waste.
answer

tremendous amounts of heat.
question

The reason a magnet will not pick up an unmagnetized plastic paper clip is that plastic paper clips are actually diamagnetic. electrons in the plastic paper clip are repelled by the magnet. protons in the paper clip are repelled the magnet. the magnet cannot temporarily magnetize the plastic paper clip.
answer

the magnet cannot temporarily magnetize the plastic paper clip.
question

An electric motor is very similar to an electric generator. an automobile battery. a radio receiver. None of the above choices are correct.
answer

an electric generator.
question

Magnetic field lines about a current-carrying wire extend radially from the wire. circle the wire in closed loops. Choices A and B are both correct. None of the above choices are correct.
answer

circle the wire in closed loops.
question

The south pole of a bar magnet is used to pick up a steel paper clip. Turn the magnet around and the bar magnet’s north pole will still pick up the paper clip. now repel the paper clip. have no effect on the paper clip.
answer

still pick up the paper clip.
question

Like kinds of magnetic poles repel while unlike kinds of magnetic poles attract. repel also. may attract or repel.
answer

attract.
question

An electromagnet is made by wrapping insulated wire around a steel nail and connecting the wire ends to a dry cell battery. If you want this electromagnet to reverse its north and south poles, then you should reverse the current flow. wrap the nail the opposite way. reverse the current flow AND wrap the nail the opposite way. reverse the current flow OR wrap the nail the opposite way, but not do both. point the nail in the opposite direction.
answer

reverse the current flow OR wrap the nail the opposite way, but not do both.
question

Break a magnet in two and you produce two magnets, each with north and south poles, only if the original magnet was large enough. end up with two pieces, one piece is a north pole and the other piece is a south pole, if the magnet was small enough. always end up with two pieces, one piece is a north pole and the other piece is a south pole, no matter how big the original magnet was. always produce two magnets, each with north and south poles, no matter what the size of the original magnet.
answer

always produce two magnets, each with north and south poles, no matter what the size of the original magnet.
question

Which scientist discovered that a compass needle may be is deflected by a current-bearing wire? Michael Faraday Ben Franklin Thomas Edison Hans Christian Oersted Allesandro Volta Andre Marie Ampere
answer

Hans Christian Oersted
question

A device that transforms mechanical energy into electrical energy is a generator. motor. transformer. magnet. none of these
answer

generator.
question

Which scientist is credited for inventing the first electric motor? Michael Faraday Ben Franklin Thomas Edison Hans Christian Oersted Allesandro Volta Andre Marie Ampere
answer

Michael Faraday
question

Which of the following materials contain billions of electrons in motion that are surrounded by tiny magnetic fields? copper wire iron nail plastic paper clip wood ruler only a and b only c and d all four of these
answer

all four of these
question

The south pole of a bar magnet is used to pick up a steel paper clip. Turn the paper clip around and the bar magnet’s south pole will still pick up the paper clip. now repel the paper clip. have no effect on the paper clip.
answer

still pick up the paper clip.
question

A device that transforms electrical energy to mechanical energy is a generator. motor. transformer. magnet. none of these
answer

motor.
question

An electric motor is very similar to an electric generator. an automobile battery. a radio receiver. None of the above choices are correct.
answer

an electric generator.
question

Electromagnets may be made stronger by wrapping them with more turns of wire. increasing the current flow around them. wrapping the wire around better conducting copper wire. all of these only a and b
answer

only a and b
question

The reason a magnet will not pick up an unmagnetized plastic paper clip is that plastic paper clips are actually diamagnetic. electrons in the plastic paper clip are repelled by the magnet. protons in the paper clip are repelled the magnet. the magnet cannot temporarily magnetize the plastic paper clip.
answer

the magnet cannot temporarily magnetize the plastic paper clip.
question

When the world one day runs out of oil, we will not be able to produce electricty anymore. True False.
answer

False.
question

Magnetism is due to the motion of electrons as they move around the nucleus. spin on their axes. Choices a and b are both correct. None of the above choices are correct.
answer

Choices a and b are both correct.
question

Nuclear power plants produce electricity because the nuclear reactions produce electrically charged particles. tremendous amounts of heat. current in a wire. chemical changes that produce current. radioactive waste.
answer

tremendous amounts of heat.
question

The reason a magnet can pick up an unmagnetized steel paper clip is that paper clips are actually magnetic. the magnet temporarily magnetizes the paper clip. electrons in the paper clip are attracted to the magnet. protons in the paper clip are attracted to the magnet.
answer

the magnet temporarily magnetizes the paper clip.
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When a magnet moves in and out of a closed loop of wire, the type of electricity that is generated is known as alternating current. direct current. ac/dc current. bipolar current. reciprocal current.
answer

alternating current.
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Several paper clips dangle in a chain from the north pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a Selected Answer: north pole. Answers: north pole. south pole. north or south pole – no difference really.
answer

north pole.
question

Oil and coal power plants produce electricity because burning the oil and coal produces electrically charged particles. current in a wire. chemical changes that produce current. tremendous amounts of heat. radioactive waste.
answer

tremendous amounts of heat.
question

If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops, one half as much voltage is induced. the same voltage is induced. twice as much voltage is induced. four times as much voltage is induced. none of these
answer

twice as much voltage is induced.
question

Break a magnet in two and you produce two magnets, each with north and south poles, only if the original magnet was large enough. end up with two pieces, one piece is a north pole and the other piece is a south pole, if the magnet was small enough. always end up with two pieces, one piece is a north pole and the other piece is a south pole, no matter how big the original magnet was. always produce two magnets, each with north and south poles, no matter what the size of the original magnet.
answer

always produce two magnets, each with north and south poles, no matter what the size of the original magnet.
question

If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil at twice the speed, one half as much voltage is induced. the same voltage is induced. twice as much voltage is induced. four times as much voltage is induced. none of these
answer

twice as much voltage is induced.
question

Like kinds of magnetic poles repel while unlike kinds of magnetic poles attract. repel also. may attract or repel.
answer

attract.
question

When a magnet is plunged in and out of a closed coil of wire, voltage is induced in the coil. If the rate of the in-and-out motion is tripled, the induced voltage is cut in half. divided by three. doubled. tripled. unchanged.
answer

tripled.
question

Magnetic field lines about a current-carrying wire extend radially from the wire. circle the wire in closed loops. Choices A and B are both correct. None of the above choices are correct.
answer

circle the wire in closed loops.
question

The reason a magnet will not pick up an unmagnetized plastic paper clip is that plastic paper clips are actually diamagnetic. electrons in the plastic paper clip are repelled by the magnet. protons in the paper clip are repelled the magnet. the magnet cannot temporarily magnetize the plastic paper clip.
answer

the magnet cannot temporarily magnetize the plastic paper clip.
question

The field(s) surrounding every stationary neutron is(are) always magnetic but never electric. always electric but never magnetic. sometimes magnetic and sometimes electric. always both electric and magnetic. none of the above
answer

none of the above
question

If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil at half the speed, one half as much voltage is induced. the same voltage is induced. twice as much voltage is induced. four times as much voltage is induced. none of these
answer

one half as much voltage is induced.
question

Electromagnets can be made weaker by wrapping them with more turns of wire. wrapping them with fewer turns of wire. increasing the current through the wire. decreasing the current through the wire both a and c. both b and d.
answer

both b and d.
question

If the north pole of a magnet is thrust into a closed loop of wire and produces a positive current, then when it is pulled back out of the loop the current will be also positive. negative. no current produced when it leaves the loop.
answer

negative.
question

Magnetism is due to the motion of electrons as they move around the nucleus. spin on their axes. Choices a and b are both correct. None of the above choices are correct.
answer

Choices a and b are both correct.
question

The picture above shows how to make an electromagnet. how to generate alternating current electricity. how to detect the magnetic field around a current-bearing wire. how to make a simple electric motor.
answer

how to make an electromagnet.
question

The field(s) surrounding every moving electron is(are) always magnetic but never electric. always electric but never magnetic. sometimes magnetic and sometimes electric. always both electric and magnetic. none of the above
answer

always both electric and magnetic.
question

Several paper clips dangle in a chain from the south pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a north pole. south pole. north or south pole – no difference really.
answer

south pole.
question

The field(s) surrounding every moving neutron is(are) always magnetic but never electric. always electric but never magnetic. sometimes magnetic and sometimes electric. always both electric and magnetic. none of the above
answer

none of the above
question

The field(s) surrounding every stationary electron is(are) always magnetic but never electric. always electric but never magnetic. sometimes magnetic and sometimes electric. always both electric and magnetic. none of the above
answer

always electric but never magnetic.

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