In a metre bridge experiment, resistance box (with R = 2Ω) is connected in the left gap and the unknown

In a metre bridge experiment, resistance box (with R = 2Ω) is connected in the left gap and the unknown resistance S in the right gap. If balancing length be 40 cm, calculate value of S. * (a) 2Ω (b) 3 Ω (c) 4 Ω (d) 2.5 Ω​

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