Magnetism

Which of the following diagrams will the iron nail become an induced magnet?

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The diagram shows a bell.

Initially, the iron core is magnetised by the upper circuit.

The iron armature has some spring attached to it that allows it to bend towards the contact.

Which of the following will cause the bell to ring?

• changing the iron core to a steel core

• increasing the coil around the iron core

• placing an open switch in the lower circuit

• removing battery P from the upper circuit

The setup shows two electromagnets with a compass placed in the midpoint between them.

The Earth’s magnetic north pole points upwards.

Which direction will the compass needle be pointing in?

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3 objects named X, Y and Z are placed with each other to study their interaction.

X repels Y and attracts Z.

Which of the following options is not a possible set of identities for the 3 objects?

• A

• B

• C

• D

An unknown object A is placed in the following scenarios.

In scenario 1, the magnet is attracted to object A.

Immediately after, the magnet is laterally inverted.

In scenario 2, the magnet is also attracted to object A.

What is the possible identity of object A?

• iron rod

• magnet

• steel rod

• silver coin