The magnetic flux `phi` (in weber ) in a closed circuit of resistance 10`Omega` varies with time t (in secnod) according to equation `phi=6t^(2)-5t+1`. The magnitude of induced current at `t=0.25` s is

Options

A. 1.2 A
B. 0.8 A
C. 0.6 A
D. 0.2 A

Answer

D

Explanation

`e=-(dphi)/(dt)`
`=12t-5=12xx0.25-5`
`=2V`
`I=(e)/(R)=(2)/(10)=0.2A`