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in Olympiad by (65.8k points)

A wire of length L and resistance R has uniform cross section. A potential difference of 10 volt is applied across the wire as shown. A cell of emf E (< 10 volt) and of internal resistance r is connected through a galvanometer between points A and C. The point C, at a distance I from A, is chosen such that the galvanometer reads zero. The length I depends on

(A) E only 

(B) E and L only

(C) E and r only 

(D) E, r and L only

1 Answer

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by (72.3k points)
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Best answer

Correct option: (B) E and L only

Explanation: 

This is a standard potentiometer when deflection is zero.

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