NEET 2007 Physics question
Three resistances P, Q, R each of and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of is connected in parallel to S the bridge gets balanced. What is the value of S?
Answer: (3)
Solution
With in parallel with S, the fourth arm has effective resistance . The balance condition of the Wheatstone bridge is . With $P = Q =
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