Electromagnetism

What produces this shape field?

• Bar magnet

• Straight wire

• Flat coil

• Solenoid

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NGSS.MS-PS2-5

This is the shape of the field around a..

• bar magnet

• straight wire

• flat circular coil

• solenoid

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What is required to make an electromagnet

• power supply

• coil of insulated wire

• magnetic core

• switch

The field shape around an electromagnet is the same shape as around a..

• bar magnet

• horseshoe magnet

• straight wire

How can you change the direction of the field in a solenoid?

• Change the number of coils

• Change the size of the current

• Change the direction of the current

• Use a soft iron core

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The field lines inside an electromagnet

• are weakest

• go from south to north

• are spread out

• go from north to south

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What does not affect the power of an electromagnet?

• Number of coils

• size of the current

• having a soft iron core

• how close together the coils are

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NGSS.MS-PS2-3

When you bring iron near an electromagnet it

• becomes magnetised

• becomes a magnet

• repels other iron

• is still magnetised after the current is switched off

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If place unmagnetised steel near an electromagnet with a soft iron core it will..

• be repelled

• not be attracted

• remain attached after the current is switched off

• fall off when the current is switched off

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

When you increase the current in a solenoid the field lines inside the solenoid...

• change direction

• are no longer uniform

• get further apart

• get closer together

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