Year 12 Magnetic Field

True or false: (Assume you have a sheet of paper that's infinitely large to draw on) Electric field lines can be a single line extending outwards, but magnetic field lines always form a closed loop

• True

• False

True or false: (Assume you have a sheet of paper that's infinitely large to draw on) Electric field lines never cross, but magnetic field lines may intersect.

• True

• False

Earth's magnetic poles are in the same place as the geographic poles.

• True
• False

What can the following represent?

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

• Tiny magnets lining up with North pole directed towards you

• A piece of modern art

• Uniform magnetic field directed into the screen away from you

• Uniform magnetic field directed out of your screen at you

Are the magnetic field lines in the picture correct?

• Yes, because they point from north to south.

• No, because they point from north to south (they're supposed to go the other way).

• Yes, because the North pole is on the left in all pictures.

• No, because the North pole is on the left in all pictures (it's supposed to be on the right).

Tags

NGSS.MS-PS2-3

Looking at the field lines in this picture, these two magnets are ________

• Attracting

• Repelling

• Attracting and Repelling

Which way are the electrons going?

• Enters through top wire, exit through the bottom wire

• Leave the power supply through bottom wire, returns to power supply through top wire

• No current needed, all charges stationary

Solenoid can be used as "magnets" if you run a current through it. Which side is the "South" of this electromagnet?

• Left hand side, because current flow from left to right

• Right hand side, because that's where the current exits the solenoid

• Left hand side, because the B field inside is pointing towards it.

• Right hand side, because the B field outside is pointing towards it.

Which way is the current flowing?

• UP

• DOWN

• anti-clockwise

• clockwise

What happens when two north poles of a magnet are placed together?

• they repel
• they attract
• they cancel each other out
• the strength of the magnet is doubled