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Q.

The resistance of a potentiometer wire 8m long is 8ohm. A high resistance box and a 2-volt accumulator are connected in series with it. What should be the value of the resistance in the box (Ohms), if it is desired to have a potential drop of 1 micro volt per mm?

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The resistance of a potentiometer wire 8m long is 8ohm. A high resistance box and a 2-volt accumulator are connected in series with it. What should be the value of the resistance in the box (Ohms), if it is desired to have a potential drop of 1 micro volt per mm?