A potentiometer wire of length 100 cm has a resistance of 10 Ω. It is connected in series with a resistance and a cell of emf 2V and of negligible internal resistance. A source of emf 10 mV is balanced against a length of 40 cm of the potentiometer wire. The value of external resistance is:

A. 790Ω

B. 890Ω

C. 990Ω

D. 1090Ω

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1

Correct Answer :
790Ω

Explanation :
No Explanation available for this question

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