EFHS -- electricity & magnetism

What happens to the magnetic force as the distance between two magnetic poles decreases?

• remains constant

• increases

• decreases

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Where is the force of a magnet strongest?

• field lines

• anodes

• cathodes

• magnetic poles

In some metals, such as iron and cobalt, the magnetic properties of the electrons do not cancel out.  For this reason, iron and cobalt are ______.

• always magnetic

• attracted by magnets

• able to induce current in a wire

• good insulators

Tags

NGSS.MS-PS2-5

When a magnet interacts with a coiled wire, what can cause electrical energy to flow?

• moving the magnet quickly

• moving the magnet slowly

• heating up the magnet

• stretching the wire

Tags

NGSS.HS-PS2-5

When a magnet is used to generate electric current in a wire, what happens if the number of coils in the wire is increased?

• magnetic field strength increases

• size of the magnet increases

• the wire heats up

• direction of magnetic field changes

Tags

NGSS.HS-PS2-5

If a wire is wrapped around an iron nail and an electric current moves through the wire, what happens to the iron nail?

• It becomes a permanent magnet

• It becomes a temporary electromagnet

• It is cooled by energy flow

• It increases voltage in the wire

Tags

NGSS.MS-PS2-5

In the diagram, where is the magnetic field strength greatest?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-3

In the diagram below, which labeled part is the permanent magnet? 

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS2-3

The permanent magnet in a motor functions by attracting and repelling the electromagnet.  This action causes the electromagnet to do what?

• spin

• increase the voltage

• power the battery

• lower the voltage

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which is not part of a motor?

• wire coils

• magnet

• brakes

• metal

Tags

NGSS.MS-ETS1-1