Numerical - Unknown resistance for given parameters of Wheatstone bridge

Q.  In a Wheatstone bridge, if P = 10 ± 1%, Q = 100 ± 1%, R = 20 ± 1% and S is unknown then the unknown resistance will be
- Published on 05 Nov 15

a. 200 ± 1%
b. 200 ± 2%
c. 200 ± 3%
d. 100 ± 1%

ANSWER: 200 ± 3%

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