Magnetism

Question 1

Laws of magnetism

Answer 1

Like poles repel

Unlike poles attract

Question 2

What are the names of the 2 magnetic poles?

Answer 2

North

South

Question 3

What are the only 3 elements that can be magnetised?

Answer 3

iron
cobalt
nickel

Question 4

What magnetic element is steel an alloy of?

Answer 4

iron

Question 5

What is a magnetic field line?

Answer 5

Shows the force in a magnetic field on another magnet
Field lines run north to south
Field lines never cross

Question 6

Expt to show the pattern of a magnetic field around a permanent bar magnet?

Answer 6

Lay paper over the magnet/s
Spinkle iron filings
Tap the paper

Question 7

Expt to show the direction of the magnetic field lines around a permanent bar magnet?

Answer 7

Place plotting compasses around the magnet/s
Draw on the paper below the direction of the needle
Join up the small arrows to get the magnetic field lines

Question 8

Describe the pattern of the magnetic field around two magnets with N and S poles facing each other

Answer 8

Uniform field between N and S poles

Beetle shape around both magnets

Question 9

Describe the pattern of the magnetic field around two magnets with N and N poles facing each other

Answer 9

Beetle shape around each magnet

Neutral point between N and N pole as the repel

Question 10

Describe the magnetic field around a bar magnet

Answer 10

Beetle shape
Field lines run N to S
Field lines never cross

Question 11

What is a magnetically hard material?

Answer 11

One that keeps retains its magnetism

eg steel

Question 12

What is a magnetically soft material?

Answer 12

One that gains and looses magnetism easily

eg soft iron

Question 13

How do you create a uniform magnetic field using 2 bar magnets?

Answer 13

Place magnets N facing S close to each other. Field in between in uniform