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Q.

A potentiometer wire 10 m long has a resistance of 40Ω . It is connected in series with a resistanced box and a 2 v storage cell. If the potential gradient along the wire is 0.01V/m the resistance unplugged in the box is

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a

760Ω

b

260Ω

c

1060Ω

d

960Ω

answer is A.

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