Question

In the figure the flux through the loop perpendicular to the plane of the coil and direciton into the paper varying according to the relation `phi=6t^(2)+7t+I` where `phi` is in milliweber and `t` is in loop at `t=2s` and direction of induced current through `R` are
A. `39mV` , right to left
B. `39mV` , left to right
C. `31mV` right to left
D. `31mV` , left to right

Answer 1

Correct Answer - D
`phi=(6t^(2)+7t+1)xx10^(-3)`
`|e|=(dphi)/(dt)=(12t+7)xx10^(-3)`
At `t=2sec` , `|e|=31xx10^(-3)V`
`phi` is increasing with time, current will be anticlockwise.