Physics

Problem

An alternating emf is represented by

ε(t)=ε_0\sin ωt

with frequency

50\,\text{Hz}

. Starting from the instant when the emf is zero and increasing positively, how much time (nearest

0.01\,\text{ms}

) will elapse before the emf first reaches

0.5\,ε_0

? a)

0.83\,\text{ms}

3.33\,\text{ms}

1.67\,\text{ms}

5.00\,\text{ms}