When will the terminal voltage of a real cell be equal to its emf?

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

When will the terminal voltage of a real cell be equal to its emf? (a) When the external resistance equals the internal resistance,

R = r

(b) When the external circuit is open,

R \rightarrow \infty

R \gg r

(d) When the external resistance is zero (short-circuit),

R = 0