Question

Q17.When a.c. passes through pure inductor then *

(a) e.m.f. leads the current by π/2

(b) e.m.f. lags the current by π/2

(c) e.m.f. leads the current by π/4

(d) e.m.f.and current are in the same phase

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Answer 1

The applied voltage reaches its maximum positive value a quarter ( 1/4ƒ ) of a cycle earlier than the current reaches its maximum positive value, in other words, a voltage applied to a purely inductive circuit “LEADS” the current by a quarter of a cycle or 90o as shown below.