IGCSE Magnetism Quiz #2a

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

Which statement about magnetism is correct?

• An unmagnetised iron bar becomes magnetised when it is placed near a magnet.

• An unmagnetised steel bar can be magnetised by passing a current through it.

• The direction of magnetic field lines is from an S-pole to an N-pole.

• The N-poles of two magnets attract each other.

In which pair are both materials magnetic?

• aluminium and copper

• copper and iron

• iron and steel

• steel and aluminium

The diagram shows the magnetic field around two bar magnets.

Which diagram shows the poles of the magnets?

• 
• 
• 
• 

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.

The switch is now closed, left closed for a few seconds, and then opened.

What do the soft-iron nails do as the switch is closed, and what do they do when the switch is then opened?

• as switch is closed - nails jump up; as switch is opened - nails fall down

• as switch is closed - nails jump up; as switch is opened - nails stay up

• as switch is closed - nails stay down; as switch is opened - nails jump up

• as switch is closed - nails stay down; as switch is opened - nails stay down

Which action will demagnetise a magnetised piece of steel?

• Cool it in a freezer for several hours.

• Hit it repeatedly with a hammer.

• Put it in a coil carrying a direct current (d.c.).

• Put it near an unmagnetised piece of iron.

Which statement about a permanent bar magnet is correct?

• It is made from a soft magnetic material.

• It repels a non-magnetic material.

• Its field lines cross each other where the magnetic field is strong.

• Its N-pole repels the N-pole of another magnet.

The diagram shows two magnets and two iron rods placed in a line.

Which magnetic poles are induced at the ends J and K of the iron rods?

• pole induced at end J = N; pole induced at end K = N

• pole induced at end J = N; pole induced at end K = S

• pole induced at end J = S; pole induced at end K = N

• pole induced at end J = S; pole induced at end K = S