Question

Assertion (A): A current-carrying wire concealed in a wall can be located by using a plotting compass.

Reason (R): The plotting compass contains a tiny pivoted magnet.

Options

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true but R is not the correct explanation of the assertion.

Explanation:

The assertion is true because a current-carrying wire creates a magnetic field around itself, which deflects a nearby compass needle and helps locate the wire. The reason is also true because a plotting compass relies on a tiny pivoted magnet to detect magnetic fields. However, this is not the correct explanation because it merely describes the construction of the compass rather than explaining how the current in the wire creates the magnetic field that causes the deflection.