A galvanometer has a current sensitivity of 1 mA per division.
A variable shunt is connected across the galvanometer and
the combination is put in series with a resistance of 500 12
and cell of internal resistance 1 12. It gives a deflection of
5 division for shunt of 5 ohm and 20 division for shunt of
25 ohm. The emf of the cell is
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