Chapter 8.1 Electromagnetism

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

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What happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

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What does this image show?

• Parallel circuit

• Series circuit

• Magnet

• Electromagnet

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The area of magnetic force around a magnet is known as its ____________.

• magnetism

• magnetic current

• magnetic field

• electric current

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The picture above is an example of what?

• Magnetic field

• Electric field

• Repulsion

• Attraction

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Which of the following is true about the magnetic field produced by a current in a flat circular

coil?

• It is uniform inside the coil

• It is the weakest at the centre

• It is the strongest at the centre

• There is no magnetic field outside the coil

What is the effect of placing a piece of soft iron core inside a solenoid carrying current?

• The resistance of the solenoid decreases

• The current in the solenoid increases

• The magnetic field becomes stronger

An electromagnet is used in these apparatus except

• a compass

• circuit breaker

• telephone earpiece

• relays

• electric bell

Which electromagnet is the strongest?

• 
• 
• 
• 

The ______ are regions where the magnetic force exerted by a magnet is strongest.

• magnetic field lines

• anodes

• magnetic poles

• cathodes

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