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The resistances P,Q,R and S in the bridg...

The resistances P,Q,R and S in the bridge shown are adjusted such that the deflection in the galvanometer G is zero when both the keys `K_(1)` and `K_(2)` are inserted. The galvanometer will show a momentary deflection if

A

first `K_(2)` is inserted and then `K_(1)`

B

first `K_(1)` is inserted and then `K_(2)`

C

`K_(1)` and `K_(2)` are both inserted but an additional resistance is put in the arm BD

D

in all the above cases

Text Solution

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The correct Answer is:
A
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