Test: Magnetism

A student uses the electrical circuit shown in the diagram to investigate electromagnetism. What happens when the switch in the circuit is closed?

• a magnetic field is produced around the copper rod

• a magnetic field is produced by the copper rod

• a magnetic field is produced by the switch

• no magnetic field is produced

The diagram shows two identical coils of copper wire. Coil 1 is wound on an iron rod. Both coils are connected to identical batteries.

• there is no magnetic field around coil 1

• there is no magnetic field around coil 2

• the iron rod makes the magnetic field around coil 1 weaker than that around coil 2

• there is a much stronger magnetic field around coil 1 than coil 2

The diagram shows two magnets, A and B. Complete the sentence below.

There will be _______________________________ between Magnet A and Magnet B.

• a force of attraction

• a contact force

• no force

• a force of repulsion

Which of the following materials is magnetic?

• paper

• rubber

• plastic

• nickel

Which of the following statements best describes a magnetically soft material.

• It is easy to bend.

• It can be magnetised temporarily.

• It has a very strong magnetic field.

• It is not attracted to a magnet.

Are all metals magnetic?

• No, no metals are magnetic

• Yes, all metals are magnetic

• No, only a few are magnetic like iron or steel

• No, only a few are magnetic like gold or silver

It is possible to use Fleming’s left-hand rule to work out the direction of the force experienced by a wire in an external magnetic field. Which of the following correctly explains how to use the rule?

• first finger field (N to S), second finger current (neg to pos), thumb movement

• first finger field (N to S), second finger current (pos to neg), thumb movement

• first finger current (neg to pos), second finger field (N to S), thumb movement

• first finger movement, second finger field (S to N)

A transformer is said to be 100% efficient. Which of the following correctly describes the relationship between power output and power input for the transformer?

• power in is greater than power out

• power in is less than power out

• power in is equal to power out

• more information is needed

The diagram shows a bar magnet. Which alphabet shows the strongest magnetic field around the bar magnet?

• A

• B

• C

• D

Two plotting compasses are placed next to a bar magnet. The arrowhead on the pointer of each compass is a north pole. The compasses point in the direction shown. Complete the diagram by labelling the two poles of the bar magnet.

• A = north

  B = south

• A = south

  B = north

• A = north

  B = north

• A = south

  B = south