Numerical -Smallest resistance variation for given input of Wheatstone bridge

Q.  A highly sensitive galvanometer is used in Wheatstone bridge and it can detect a current as low as 80 pA. The resistances of each arm of bridge are 800 ohm and the resistance of galvanometer is 40 ohm. If an input of 20 V is applied to the bridge then the smallest change in resistance which can be detected is
- Published on 05 Nov 15

a. 10.752 μA
b. 15.280 μA
c. 17.351 μA
d. 23.719 μA

ANSWER: 10.752 μA

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