Verified Solution • 2025–26 Session moderate

QAIPMT-2006-Ch-2379: NEET 2006 Physics - Class 12 AIPMT-2006-Ch-2379 Solution: Three resistances, P, Q, R each of \(2 \) and an unknown…

Three resistances, P, Q, R each of 2Ω2\Omega and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6Ω6\Omega is connected in parallel to S the bridge gets balanced. What is the value of S?

Multiple Choice Options

  • A 3Ω3\Omega
  • B 6Ω6\Omega
  • C 1Ω1\Omega
  • D 2Ω2\Omega.

Step-by-Step Verified Solution

A balanced wheatstone bridge simply requires P Q = R S _ 2 2 = 2 S Therefore, S should be 2 � . A resistance of 6 � is connected in parallel. In parallel combination, 1 R = 1 R 1 + 1 R 2 1 2 = 1 6 + 1 S _ S = 3 �

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