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potentiometer

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Question

A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of 10 ohm. Its internal resistance is

Moderate
Solution

Internal resistance r=Rl1l2l2                                       r=10110100100                                       r=1Ω


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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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