Physics
Assertion (A): The terminal voltage of a cell is always less than its e.m.f.
Reason (R): More the current drawn from the cell, the less is the terminal voltage.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.
Current Electricity
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Answer
assertion is false but reason is true.
Explanation
Assertion (A) is false. E.m.f. is greater than the terminal voltage only when the cell delivers the current to the external circuit.
Reason (R) is true. When a heavy current is drawn from the cell, a large number of charge carriers flow through the electrolyte and hence more work is done. This results in more voltage drop v, and hence less terminal voltage V. Thus, terminal voltage V of a cell depends on the amount of current I drawn from it.
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