A potentiometer wire of length 100cm has a resistance of 10Ω. It is connected in series

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

Options

(a) 760Ω
(b) 640Ω
(c) 790Ω
(d) 840Ω

Correct Answer:

790Ω

Explanation:

No explanation available. Be the first to write the explanation for this question by commenting below.

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Topics: Current Electricity (136)
Subject: Physics (2479)

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