Magnets

Question 1

What do you call the two ends of a bar magnet?

Answer 1

The poles

Question 2

Where are the magnetic forces strongest

Answer 2

At the poles of a magnet

Question 3

True or false: like poles attract each other

Answer 3

False; they repel

Question 4

What is the difference between a permanent magnet and an induced magnet?

Answer 4

A permanent magnet has its own magnetic field and an induced magnet needs to be placed in a magnetic field to become a magnet

Question 5

What are the 4 magnetic materials?

Answer 5

Iron, steel (because it is an alloy of iron), cobalt & nickel

Question 6

What is a magnetic field?

Answer 6

A magnetic field is a region around a magnet where a force acts on another magnet or magnetic material

Question 7

True or false: the magnetic field line runs from the North Pole to the South Pole

Answer 7

True

Question 8

True or false: the earth has its own magnetic core

Answer 8

True

Question 9

What happens when a current flows through a conducting wire

Answer 9

A magnetic field is produced around the wire

Question 10

Name 3 ways you can increase the strength of the magnetic field around a wire

Answer 10

-Increase the current
-Coil the wire, creating a solenoid
-Place a bar of iron in the middle of a solenoid, creating an electromagnet

Question 11

A.) What is the name of the technique used to work out the direction of the magnetic field produced by a wire and B.) How does it work?

Answer 11

A.) The right hand grip rule. B.) By curling your fingers up and pointing your thumb in the direction of the conventional current, the direction your fingers are curled in is the direction of the magnetic field