Electromagnet Review

Which of the following are magnetic poles?

• North and South

• East and West

• Red and blue

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NGSS.MS-PS2-3

Where are the field lines most concentrated around a bar magnet?

• at both poles

• in the middle

• at the North pole only

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NGSS.MS-PS2-5

In a generator how is the magnetic field created?

• Turning the coil through the magnetic field.

• The electrical output creates the magnetic field.

• Make sure the poles are S facing S.

• Plug the generator in.

What THREE ways are electromagnets different from permanent magnets?

• they can be turned off and on

• they can increase in strength by increasing the current in the wire

• they are smaller in size

• they can change which is the north and south pole

What makes an electromagnet?

• A coil of copper wire wrapped around an iron core connected to the battery

• A battery

• A coil of copper wire

• A permanent magnet

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NGSS.MS-ETS1-1

How could you make electromagnet stronger?

• adding more loops of wire

• increasing the current flowing through the wires

• increasing the size of the iron core

• None of the above

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NGSS.MS-PS2-3

How does he turn the electromagnet off?

• Touching the wire with his hands

• By disconnecting it from the battery

• By pulling the screw out of the coils of wire

• He used "the force"

What are the ways you can change the strength of the electromagnet to make it stronger?

• Add more turns in the coil

• Add fewer turns in the coil

• Add more current flowing through the coil (more electricity)

• Add less electricity flowing through the coil

• Swap out the core and add a ferromagnetic material

Tags

NGSS.MS-PS2-3

Electromagnet            Number of wire loops
R                                 80
S                                 120
T                                 100
U                                 115  
Each letter represents an electromagnet with the number of its wire loops listed beside it.  Which electromagnet will attract or repel a bar magnet with the greatest force?

• R

• S

• T

• U

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which electromagnet is stronger?

• A

• B

Tags

NGSS.MS-PS2-3