Magnet and Electrical

which statement of 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?

• A

• B

• C

• D

In which pair are both materials magnetic?

• aluminium and copper

• copper and iron

• iron and steel

• steel and aluminium

Which action will demagnetise a magnetised piece of steel?

• Cool it in a freezer for several hours.

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

• Put it near an unmagnetised piece of iron.

• Hit it repeatedly with a hammer.

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

Two magnets are placed near a current-carrying coil. The diagram shows this experimental arrangement and the current direction in the coil. Which statement is correct?

• Both X and Y are repelled by the coil.

• Both X and Y are attracted to the coil

• X is attracted to the coil and Y is repelled.

• X is repelled by the coil and Y is attracted.

The three diagrams each show two magnets. In which diagrams do the two magnets attract each other?

• 1 only

• 2 only

• 1 and 3

• 2 and 3

The diagram shows the magnetic fields around three objects, P, Q and R, placed close to each other. Which row shows the nature of each of the objects?

• A

• B

• C

• D

A bar magnet picks up two steel bolts. Which diagram shows the magnetic poles induced in the bolts?

• A

• B

• C

• D

Which diagram shows the magnetic field around a bar magnet?

• A

• B

• C

• D