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Q.

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

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a

external resistance is infinity

b

internal resistance is zero

c

both 1 and 2

d

none

answer is C.

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Detailed Solution

detailed_solution_thumbnail

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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