The difference between EMF (E) of the cell and terminal voltage (V) of a cell is called ______.

critical voltage

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potential across cell

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lost voltage

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none of these

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Solution

The correct option is C lost voltage
Because of internal resistance of a battery, a part of EMF has been dropped within the cell. This voltage is not available in the terminal.
Total EMF of a battery = PD across terminal + lost voltage within the battery.

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State two difference between the e.m.f. and terminal voltage of a cell.

E

r

r

E

r

(V)

r

n r

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