In the network shown, when switch S is open balancing length AN1 = 60 cm and when the switch S is closed, balancing length AN2 = 50 cm. then the value of r is

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0.75 Ω

1.5 Ω

0.5 Ω

1 Ω

answer is D.

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Detailed Solution

r=Ri1i2−1=56050−1Ω=1Ω

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