Electromagnetism

A compass needle responds to a magnetic field, because the compass needle is a

•  generator.

•  motor.   

•  magnet.

•  transformer.

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A _______________ is a current-carrying coil of wire with many loops.

• magnet

• electromagnet

• solenoid

• compass

What happens to the strength of a magnetic field as you move away from the magnet?

• The strength of the magnetic field increases.

• The strength of the magnetic field doesn't change.

• The strength of the magnetic field is doubled.

• The strength of the magnetic field decreases.

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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 lines on this image are called...

• magnetic field lines

• iron fillings

• graphite lines

• none of these

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You can make an electromagnet stronger by...

• increasing the current through the wire

• make the iron core bigger

• increase the number of loops around the core

• All of these

If you cut a magnet in half, what happens to the poles?

• One half gets the North Pole, the other half gets the South Pole

• Both halves get only a North Pole

• Both halves get only a South Pole

• Both halves get a North pole and a South Pole

How can a wire become magnetic?

• point it north

• add a resistor

• heat it up

• run a current through it

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Magnetic poles and electric charges are similar in that...

• like poles repel and opposites attract

• magnetic force is equal to electric force

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