Test on Electromagnetism

Which part of the electromagnets turned into a magnet when electricity flows through a coiled wire?

• Battery

• Copper wire

• Iron Nail

• Bulb

Electric currents produce _____________

• electron clouds

• magnetic fields

• sound waves

How can the strength of an electromagnet be increased? (mark all that apply)

• increase the current flowing through the coil

• increase the number of coils

• add an amplifier to it

• put iron core inside the coil

Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet
• an enemy

What are the ends of a magnet called?

• East and west poles
• Left and Right ends
• North and South ends
• North and South poles

What effect will the south pole of one magnet have on the south pole of another magnet?

• Repel

• Attractive
• Combative
• No effect

In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

• wire, iron, electric
• electric, wire, iron
• iron, electric, wire
• excited, hair, apple

What is the role of the battery in the electromagnet?

• It provides light energy for the electromagnet.

• It provides magnetic field for the electromagnet.

• It provides sound energy for the electromagnet.

• It provides the power source for the electromagnet.

When two magnets repel, they ________________

• change color
• pull together
• push apart
• get colder

Which electromagnet is stronger?

• A

• B