When the back e.m.f in a circuit is zero, it draws?

Maximum current

Zero current

Minimum current

Average current

Back e.m.f (electromotive force) is the voltage opposing the applied voltage, commonly seen in motors and inductive circuits.

When back e.m.f = 0, there is no opposing voltage, so the entire applied voltage appears across the circuit's resistance.

From Ohm's Law:

$I = V - back e.m.f$

If back e.m.f = 0, then

I=V/R(maximum possible current)