magnetism

Which of these is not a magnetic material?

• aluminium

• steel

• nickel

• iron

Which of the above diagrams shows the magnetic field lines around the north pole of a magnet?

• A

• B

• C

• D

Some magnets are easily magnetised when placed in a magnetic field, and then quickly lose their magnetism once the field is removed. These materials are used in electromagnets, and are called...

• soft magnetic materials

• hard magnetic materials

• temporary magnets

• partial magnets

Which diagram shows the poles of the magnets?

• A

• B

• C

• D

An electromagnet with a soft iron core is connected to a battery and an open switch. The soft iron core is just above some small soft iron nails.

• A

• B

• C

• D

A student wishes to make a permanent magnet. She has an iron rod and a steel rod. Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?

• A

• B

• C

• D

What do the lines around this magnet represent?

• North Pole

• South Pole

• Magnetic Declination

• Magnetic Field

Which statement about a magnet is correct?

• A magnet attracts a gold rod.

• A magnet does not attract a plastic rod.

• A magnet never repels another magnet.

• A magnet sometimes repels an unmagnetised nickel rod.

A student wishes to make a permanent magnet. She has an iron rod and a steel rod.

Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?

• rod = iron; type of magnetic material = hard

• rod = iron; type of magnetic material = soft

• rod = steel; type of magnetic material = hard

• rod = steel; type of magnetic material = hard

Two nickel bars are placed close to the N-pole of a bar magnet. The nickel bars become magnetised.

Which row states the pole induced at P, the pole induced at Q, and the type of magnetic force between P and Q?

• pole induced at P = N; pole induced at Q = S; force between

  P and Q = attraction

• pole induced at P = N; pole induced at Q = S; force between

  P and Q = repulsion

• pole induced at P = S; pole induced at Q = N; force between

  P and Q = attraction

• pole induced at P = S; pole induced at Q = N; force between

  P and Q = repusion