Electromagnets

The magnetic field around a solenoid is ____________ the magnetic field around a straight wire.

• stronger than

• weaker than

• the same strength as

Tags

NGSS.HS-PS2-5

The scientific name for a coil of wire with a current flowing through it is a (a)   .

If the direction of the current flowing in a wire is reversed, the magnetic field will...

• disappear

• stay the same

• reverse direction

• get stronger

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which rule do we use to find the shape of the magnetic field around a current-carrying wire.

• Fleming's left hand rule

• The right hand thumb rule

In the right hand thumb rule, the direction of the current is shown by the (a)   .

In the right hand thumb rule, the direction of the magnetic field is shown by the curl of the (a)   .

The magnetic field of a solenoid is strongest inside the coil.

• True

• False

Select the advantages of electromagnets over permanent magnets.

• Can be turned on and off

• Heat up quickly

• Their strength can be altered

• They require electricity

Select the uses of electromagnets.

• Fridge doors

• Scrap yard magnets

• MagLev trains

• Magnetic door locks

• Recycling separators

How can the strength of an electromagnet be increased?

• Increase the number of coils

• Use a DC power supply

• Increase the current

• Use a softer core