Q.

The terminal PD of a cell is equal to its emf if

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a

internal resistance is zero

b

none

c

external resistance is infinity

d

both 1 and 2

answer is C.

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Detailed Solution

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The terminal potential difference of a cell is equal to the emf of the cell when:

The cell is an open circuit.                      

The internal resistance of the cell is zero.

The load resistance (or the external resistance) is much greater than the internal resistance (in other words could be said as infinity)

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