In which pair are both materials magnetic?

• aluminium and copper

• copper and iron

• iron and steel

• steel and aluminium

Which diagram shows the poles of the magnets?

• A

• B

• C

• D

Which action will demagnetise a magnetised piece of steel?

• cool it in a freezer for several hours

• hit it repeadtly with a hammer

• put it in a coil carrying a direct current

• put it near an unmagnetised piece of iron

Which metal could be used for a permanent magnet and which metal could be used for the core of an electromagnet?

• A

• B

• C

• D

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

• 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 wire perpendicular to the page carries an electric current in a direction out of the page. There are four compasses near the wire. Which compass shows the direction of the magnetic field caused by the current?

• A

• B

• C

• D

The diagram shows apparatus that can be used to make a magnet.

• A

• B

• C

• D

A strong electromagnet is used to attract pins. What happens when the current in the coil is halved?

• A

• B

• C

• D

A coil carries a current in a magnetic field. The coil experiences a turning effect. Which device uses this effect?

• d.c. motor

• electromagnet

• relay

• transformer