Question

If an AC current is given by
I=Io sin2pi(n)t
then time taken by the current to change from the ems value to zero is equal to
(A)1/n
(B)1/2n
(C)1/4n
(D)1/8n

Answer 1

Answer:

Irms=I0sin2πnt=I02√

⇒sinωt=sin2πnt=12√=sinπ4

⇒t=π4×12πn=18n