Question

In a circuit containing an inductance of zero resistance, the e.m.f. of the applied ac voltage leads the current by(a) 90°(b) 45°(c) 30°(d) 0°

Answer 1

answer : option (a) 90°

explanation :- it is given that a circuit containing an inductance of zero resistance.{e.g., pure inductor }

we know, in a circuit containing a pure inductance only, the current is delayed by 90°.

see diagram, here it is clearly shown below.
here voltage graph starts from peak value while inductor starts from zero. so, the current is delayed by 90° . hence, In a circuit containing an inductance of zero resistance, the e.m.f. of the applied ac voltage leads the current by 90°