Electromagnets 8

What is a solenoid?

• A spiral coil of wire

• A magnetic core

• An electromagnetic field

• A temporary magnet

How is a magnetic field shown?

• Field lines with arrows

• Compasses pointing north

• By repelling magnets

• By attracting magnets

What is shown in red?

• North seeking pole of a permanent magnet

• South seeking pole of a permanent magnet

• South seeking pole of a temporary magnet

• South seeking pole of a temporary magnet

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The strength of the magnet is shown by ...

• field lines close together

• field lines far apart

• more arrows on field lines

• less arrows on field lines

Why is a steel core ineffective in an electromagnet?

• It can not be switched off

• It stays magnetised after being switched off

• It can not be magnetised

• It takes a long time to magnetise

Identify the ways and electromagnets strength can be increased.

• Add more turns to the coil

• Increase the current

• Increase the number of cores

• Add more switches into the circuit

An electromagnet is an example of a permanent magnet.

• True

• False

Which number indicates the circuit breaker?

• 2

• 7

• 1

• 4

Which number indicates what part is attracted to the electromagnet?

• 8

• 6

• 5

• 1

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which combination of seeking poles would attract?

• North North

• South South

• South North

Tags

NGSS.3-PS2-3

NGSS.3-PS2-4