EMI Questions

The current $i$ in a coil varies with time as shown in the figure. The variation of induced emf with time would be:

In a coil of resistance $10\Omega$, the induced current varies with time as a triangle (peak $4\text{A}$ at $t=0$, zero at $t=0.1\text{s}$). The change in flux is:

A coil of resistance $400\Omega$ is placed in a magnetic field. If the magnetic flux $\varphi$ (Wb) linked with the coil varies with time $t$ (s) as $\varphi =50t^2+4$, the current in the coil at $t=2\text{s}$ is:

The current ($I$) in the inductance is varying with time according to the plot shown. Which one is the correct variation of voltage with time in the coil?

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is:

A thin semicircular conducting ring ($PQR$) of radius '$r$ ' is falling with its plane vertical in a horizontal magnetic field $B$. The potential difference developed across the ring when its speed is $v$, is:

A long solenoid has 1000 turns. When a current of $4\text{A}$ flows through it the magnetic flux linked with each turn of the solenoid is $4\times 10^{-3}\text{Wb}$. The self-inductance of the solenoid is: