A long solenoid of radius R carries | EMI

JEE MAIN 2020

07-01-20 S1

Question

A long solenoid of radius R carries a time $(t)$ dependent current $\mathrm{I}(\mathrm{t})=\operatorname{lot}(1-\mathrm{t})$. A ring of radius $2 R$ is placed coaxially near its middle. During the time interval $0 \leq \mathrm{t} \leq 1$, the induced current ( $\mathrm{I}_{\mathrm{R}}$ ) and the induced $\operatorname{EMF}\left(V_R\right)$ in the ring change as:

Select the correct option:

Direction of $I_R$ remains unchanged and $V_R$ is zero at $t=0.25$

Direction of $I_R$ remains unchanged and $V_R$ is maximum at $t=0.5$

At $t=0.5$ direction of $I_R$ reverses and $V_R$ is zero

At $t=0.25$ direction of $I_R$ reverses and $V_R$ is maximum

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution