Basic Magnetism
When a current begins to flow through a wire, which of these objects placed close to the wire would change?
A - a thermometer
B - a compass
C - a prism
D - tissue paper
B - a compass
Wire was looped around an iron nail, and the wires ends were connected to a battery. Why was this device likely made?
A - to produce a heat source
B - to demonstrate frictional forces
C - to create a magnetic field
D - to generate sound wave
C - to create a magnetic field
A student uses two long wires to connect a lightbulb to a battery. As soon as it was connected, a nearby compass stopped pointing towards the North Pole. What caused this happen?
A - heat from the lightbulb
B - light produced by the lightbulb
C - electric field produced by the battery
D - magnetic field produced by the current
D - magnetic field produced by the current
Which direction do magnetic field lines travel?
A - North to south
B - South to North
C - North to North
D - South to South
A - north to south
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Which of these will always produce a magnetic field?
A - a bar of steel
B - a bar of aluminum
C - an electric current flowing through a wire
D - An electric charge
C - an electric current flowing through a wire
Which set of conditions will produce an electric current in a closed loop of wire?
A - a magnet touching the loop of wire
B - a magnet at rest inside the loop of wire
C - a magnet at rest outside the loop of wire
D - a magnet passing through the loop of wire
D - a magnet passing through the loop of wire
A generator converts mechanical energy into electrical energy by using a conducting metal loop turning in a __________.
A - magnetic field
B - Gravitational field
C - steep sphere
D - copper sphere
A - magnetic field
Why does a compass needle turn when a current is created?
A - the current is conducted by the needle
B - the current demagnetizes the needle
C - the current produces an electric field
D - the current produces a magnetic field
D - the current produces a magnetic field
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What arrangement(s) of the poles would cause the field lines to repel each other? (Select all that apply)
A - N to N
B - S to S
C - N to S
A and B
What happens when you turn a wire around a nail and connect both ends of the wire to a battery?
A - a magnetic field is produced
B - the iron in the nail will break down
C - the battery’s charge gets depleted
D - rusting will form on the nail
A - a magnetic field is produced
When a loop of bundled wire to connected to a battery, it will rotate. When it is disconnected, it stops rotating. Which of these statements best explains why the loop only turns when the motor is connected to a battery?
A - the battery moved electrons in the permanent magnets to build an electric field
B - the battery causes the loop to conduct electricity through the magnets
C - the battery moves electrical charges through the cooper loop creating a magnet field
D - the battery pushes protons through the commutator, causing magnetism
C - the battery moves electrical charges through the copper loop creating a magnetic field
Select ALL that apply to an electric motor.
A - uses electricity
B - uses mechanical energy
C - creates electricity
D - creates mechanical energy
A and D
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What arrangement of poles would cause the magnetic field lines to be attracted to each other?
A - N to N
B - S to S
C - N to S
C - N to S
A bar magnet was moved back and forth in a coil of copper wire. The ends of the wire were connected to a light bulb and a meter. Why was this device created?
A - to generate electric current
B - to increase the strength of the magnet
C - to heat the copper wire
D - to transfer protons to the lightbulb
A - to generate electric current
The concept of electromagnetic induction can be used to explain the operation of __________.
A - Lightbulb
B - Resistor
C - Transformer
D - Transistor
C - Transformer
What are all the items that can increase the strength of an electromagnet. (Select ALL the answers)
A - Increasing the number of loops in the wire
B - Placing it near the N pole of another magnet
C - increasing the current
D - inserting a piece of iron inside the loops of wire
A, C, and D
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How can a magnet make a lightbulb glow when the lightbulb is connected to a coil of wire?
A - the magnet creates electrons in the wire producing electricity
B - the electrons in the wire make an electric force that pushes against the magnet
C - the wire is a magnet that interacts with the electrical force of the magnet
D - the motion changes the magnetic field which causes the electrons to move in the wire
D - the motion changes the magnetic field which causes the electrons to move in the wire
Why is an electromagnet more useful than a regular magnet? (Select ALL that apply)
A - the magnetism can be turned on or off by turning the current on or off
B - The strength of magnetic field can be controlled by changing the current
C - electromagnets have stronger north poles and weaker south poles, resulting in more electrical current
D - it is more environmentally friendly
A and B
Which device converts mechanical energy into electrical energy?
A - generator
B - motor
C - solenoid
D - meter
A - generator
Which of these functions causes doorbells to work?
A - Friction
B - Gravity
C - Inertia
D - Magnetism
D - magnetism
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