Question

The magnetic flux in a closed circuit of resistance `20 Omega`, varies with time (t) according to equation `phi=8t^(2)-6t+5`. What is the magnitude of induced current at time `t=1` sec ?
A. 0.25 A
B. 0.5 A
C. 0.75 A
D. 0.1 A

Answer 1

Correct Answer - B
`e = (d phi)/(dt)= d/(dt)(8t^(2)-6t+5)`
`:. e= 16 t -6 = 16 xx 1-6=10V`
`:. I=e/R=10/20 = 0.5 A`.