Magnetic Fields

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

The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

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).

What does the following represent?
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

• Multiplied by a billion
• 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

What is the shape of a magnetic field around a wire?

• 
• 
• 
• 

A straight wire carrying current is shown. What is the magnetic field direction surrounding the wire?

• clockwise

• counterclockwise

A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the solenoid

• will become zero

• will increase

• will decrease

• will remain unaffected

What is the direction of the current in the wire?

• up
• down
• left
• right

What is direction of the magnetic field around the wire?

• clockwise
• counterclockwise

Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire?

• A

• B

• C

• D