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The emf of the driver cell of a potentio...

The emf of the driver cell of a potentiometer is `2 V`, and its internal resistance is negligible. The length of the potentiometer wire is `100 cm`, and resistance is `5 omega`. How much resistance is to be connected in series with the potentiometer wire to have a potential gradient of `0.05 m V cm^(-1)`?

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