Current Electricity and Electrical InstrumentHard
Question
A whetstone′s bridge is balanced with a resistance of 625 Ω in the third arm, where P, Q and S are in the 1st 2nd 4th arm respectively. If P and Q are interchanged, the resistance in the third arm has to be increased by 51Ω to secure balance. The unknown resistance in the fourth arm is
Options
A.625 W
B.650 Ω
C.676 Ω
D.600 Ω
Solution
........(i)
........(ii)From (i) & (ii)
(676) (625) = S2 ⇒ S = 650Ω
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