Question

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

Answer 1

Correct Answer - D
Induced emf, `e=|(dphi)/(dt)|=|12t-5|`
`"At "t=0.25srArre=2V`
`therefore"Induced current, i"=(e)/(R)=0.2A`