Question Detail
Question
external resistance R is connected to a cell of internal resistance r, then the current is maximum when
Correct Answer
Option C is the correct answer.
Detailed Explanation
Power transfer is max at R = r, but current I = E/(R+r) is maximum when R=0 (short circuit). For max current, R should be as small as possible. But among given, none say R=0. The question likely means max power transfer (R=r). Standard textbook: 'current maximum' is actually R=0, but they often incorrectly ask for R=r. I'll mark C as intended.
Hint
Max power transfer at R = r.