Electricity and Magnetism

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Moderate

Periods of Oscillation of Alternating Current

EANDM-XB9U1R

An alternating current is flowing in a circuit according to the equation $I(t)=(5\,A)sin(40t)$. At $t=0\,s$ the current is zero.

At what subsequent time will the current first be at $-5\,A$?

A

$t=0.16\,sec$

B

$t=0.12\,sec$

C

$t=0.48\,sec$

D

$t=0.02\,sec$