Assertion(A): In a balanced Wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.
Reason (R): Potentiometer is superior in measuring potential difference than voltmeter.

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A is true but R is false

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

Both A and R are true and R is NOT the correct explanation of A.

A is false but R is true

answer is A.

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Detailed Solution

For balanced Wheatstone bridge which is shown in figure a, P/Q=S/R

If we interchange the cell and galvanometer then circuit becomes as shown in figure b.

and balanced condition, P/S=Q/R⇒P/Q=S/R

Thus, balanced point remains unchanged.

Potentiometer is superior in measuring potential difference than voltmeter as in balanced condition it does not draw any current from the cell.

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