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Q.

A potentiometer wire of length 100cm has resistance 5Ω . It is connected in series with a resistance and a cell of emf 2v and of negligible internal resistance. A source of emf 5mv balanced by 10 cm length of potentiometer wire. The value of external resistance is _____

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a

540Ω

b

195Ω

c

190Ω

d

990Ω

answer is B.

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Detailed Solution

E'=iρI=ER+R3RL⋅l5×10−3=25+R35100×10Rs=195Ω
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