Wheatstone bridge - Formula for finding unknown resistance

Q.  In a Wheatstone bridge, the formula for finding unknown resistance (R2) is given by

R2 =  R2R3/R1

Where, R1= 150Ω± 0.1%
    
R2 = 250Ω ± 0.1%

R3 = 300Ω ± 0.1%

The value of unknown resistance is
- Published on 03 Nov 15

a. R2 = 250Ω ± 0.1%
b. R2 = 300Ω ± 0.3%
c. R2 = 750Ω ± 0.3%
d. R2 = 500Ω ± 0.3%

ANSWER: R2 = 500Ω ± 0.3%

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