Electromagnetic Induction

The variation of EMF with time for four types of generators are shown in the figures. Which amongst them can be called AC? (a) (b) (c) (d)

In the above diagram, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions:

Two conducting circular loops of radii $R_{1}$ and $R_{2}$ are placed in the same plane with their centres coinciding. If $R_{1}\gg\,R_{2}$, the mutual inductance $M$ between them will be directly proportional to:

A uniform magnetic field is restricted within a region of radius,$r.$ The magnetic field changes with time at a rate,$\frac{d\vec{B}}{dt}$. Loop one of radius $R>r$ encloses the region, $r$ and loop two of radius, $R$…

A thin semicircular conducting ring $\left(PQR\right)$ of radius $r$is falling with its plane vertical in a horizontal magnetic field $B,$ as shown in figure. The potential difference developed across the ring when its…

A $800$ turn coil of the effective area $0.05m^{2}$ is kept perpendicular to the magnetic field $5\times\,10^{-5}T.$When the plane of the coil is rotated by $90^{o}$ around any of its coplanar axis in $0.1s,$ the emf…

A square loop of side 1 m and resistance 1 Ω is placed in a magnetic field of 0.5 T. If the plane of loop is perpendicular to the direction of magnetic field, the magnetic flux through the loop is:

A 800 turn coil of the effective area 0.05 m2 is kept perpendicular to the magnetic field 5$\times$10-5 T. When the plane of the coil is rotated by 90o around any of its coplanar axis in 0.1 s, the emf induced in the…

The magnetic flux linked with a coil (in \$Wb$) is given by the equation \$ϕ=5t^{2}+3t+16$. The magnitude of induced emf in the coil at the fourth second will be:

A conducting loop of finite resistance lies on the $x$-$y$ plane. There is a constant magnetic field in the $z$ direction. The area of the loop varies with time $t$, as $A=A_0(1+\sin t)$ in appropriate units. The figure…

A thin semicircular conducting ring PQR of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v,…

Two identical inductors are connected in two different configurations P and Q, where a time varying current $I(t)$ is flowing, as shown in the figure. The induced emf between points $a$ and $b$ for configuration P is…