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In the figure a long uniform potentiomet...

In the figure a long uniform potentiometer wire AB is having a constant potential gradient along its length. The null points for the two primary cells of emfs `epsilon_(1) " and " epsilon_(2)` connected in the manner shown are obtained at a distance of 120 cm and 300 cm from the end A. Find (i) `epsilon_(1)//epsilon_(2)` and (ii) position of null point for the cell `epsilon_(1)`.
How is the sensitivity of a potentiometer increased ?

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