(A): Wheatstone Bridge provides practical method for determination of an unknown resistance.
(R): The error in measuring the unknown resistance is minimum in meter bridge experiment, if the balance point is close to 50 cm.

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Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’

‘A’ is false and ‘R’ is false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

‘A’ is true and ‘R’ is false

answer is B.

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Detailed Solution

A meter bridge works on the principle of a Wheatstone bridge. A Wheatstone bridge is based on the principle of null deflection, i.e., when the ratio of resistances in the two arms is equal, no current will flow through the middle arm of the circuit.

The percentage error in the measurement of resistance by a metre bridge is minimum when the null point is near about the centre of the wire.

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