Magnetic flux (in weber) in a closed circuit of resistance $20\,\Omega$ varies with time $t$ (s) as $\phi = 8t^2 - 9t + 5$. The magnitude of the induced current at $t = 0.25$ s will be $\_\_\_\_$ mA.
Magnetic flux (in weber) in a closed circuit of resistance $20\,\Omega$ varies with time $t$ (s) as $\phi = 8t^2 - 9t + 5$. The magnitude of the induced current at $t = 0.25$ s will be $\_\_\_\_$ mA.