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The resistance of a potentiometer wire o...

The resistance of a potentiometer wire of length 10m is 20 ohm. A resistance box and a 2 volt accumulator are connected series with it. Resistance required to be introduced in the box to have a potential drop of one microvolt per millimeter of the potentiometer wire will be

A

`3880Omega`

B

`3980Omega`

C

`2500Omega`

D

`3600Omega`

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