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The resistance of a potentiometer wire 8...

The resistance of a potentiometer wire 8 m long is 8 ohm. 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, if it is desired to have a potential drop of 1 micro volt per mm?

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The correct Answer is:
1992 `Omega`
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