Electricity and Magnetism Quiz

Electric motors are used to move cars, boats, and trucks. Which of the following is necessary for a motor to work?

• magnetism and heat

• heat and electricity

• gravity and electricity

• electricity and magnetism

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This is a simple electromagnet. What is creating the magnetic field around an electromagnet?

• the nail

• the battery

• the paper clip

• the electric current in the wire

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James and Anthony have both built their own electromagnets. Anthony’s electromagnet can pick up heavier objects than James’ magnet can. What could be the cause of this?

• Anthony is using a longer bolt to create his electromagnet.

• Anthony is holding his electromagnet closer to the battery than James.

• Anthony’s battery is lying on its side, allowing the electricity to flow through the wires more easily.

• Anthony has more wire loops around his bolt creating a stronger magnetic field.

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In an electric motor what is the effect of the magnetic field on the wire coil?

• There is no movement.

• The wire coils will rotate.

• The magnetic poles reverse.

• Electricity is recycled into the motor.

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If you make an electromagnet, why should you place an iron rod in the coil?

• You move it in and out of the coil.

• It makes the magnetic field stronger.

• It lets you turn the electromagnet on and off.

• You hold it so the electricity won’t hurt you.

How can a magnet create electricity?

• A magnetic field pushes and pulls protons in an object.

• A magnetic field pushes and pulls electrons in an object.

• An electric current flows through a magnet.

• An electric current creates an electromagnet.

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What advantage does an electromagnet have over a permanent magnet?

• Electromagnets are easier to make than permanent magnets.

• Electromagnets are lighter than permanent magnets.

• Electromagnets can attract different materials than permanent magnets.

• Electromagnets can be turned off and on.

Look at the diagram of the electromagnet. How can the power of the electromagnet be increased?

• Change the nail to a straw.

• Change the wire to a string.

• Wrap the wireless times around the nail.

• Wrap the wire more times around the nail.

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Kaitlyn is trying to build a small generator. She loops one wire around a large magnet and another wire around a compass. She then attaches the ends of the wire together to complete the circuit. She waits, but nothing happens. What suggestion would best help Kaitlyn with her generator?

• Wrap the wire tightly around the magnet.

• Replace the magnet with one that is larger.

• Move the magnet back and forth inside the wire loops.

• Add more wire loops around the magnet.

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How does a generator create electric current?

• motion in a series circuit

• motion in a magnetic field

• magnets in a parallel series of wires

• magnet and wires have to form a circuit