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In a potentiometer experiment for measur...

In a potentiometer experiment for measuring the emf of a cell, the null point is at 240 cm when we have a `500 Omega` resistor in series with the cell and galvanometer. If the series resistance is reduced to half, the null point will be at :

A

480 cm

B

240 cm

C

120 cm

D

60 cm.

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