First slide

combination of resistance

Question

In the wheat stone bridge shown, no current flows through the galvanometer G. If P and S are interchanged and the galvanometer and the battery are interchanged

Moderate

A

Current through the galvanometer flows from A to B
B

No current flows through the galvanometer
C

Current through the galvanometer flows from B to A
D

None of the above option is true

Solution

Initially the bridge is balanced and $\frac{P}{Q} = \frac{R}{S} . . . (1)$
Finally, the bridge will be balanced again, if $\frac{R}{P} = \frac{S}{Q}$ if $\frac{P}{Q} = \frac{R}{S}$ [Equation .. (1)] Hence, option (2) is satisfied.

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