Embibe Experts Solutions for Chapter: Electromagnetic Induction, Exercise 3: BEGINNER'S BOX - 3

Flux linked through following coils changes with respect to time then for which coil an e.m.f. is not induced :-

A coil and a magnet moves with constant speeds $5 \mathrm{m} {\mathrm{s}}^{-1}$ and $3 \mathrm{m} {\mathrm{s}}^{-1}$, respectively, towards each other. Then, induced emf in coil is $16 \mathrm{mV}$. If both move in same direction, then induced emf in coil is,

Magnetic flux $\varphi$ (in Weber) linked with a closed circuit of resistance $10 \Omega$ varies with time $t$ (in seconds) as $\varphi =5t^2-4t+1$. The induced emf in the circuit at $t=0.2 \mathrm{s}$ is,

Magnetic flux linked through the coil changes with respect to time according to following graph, then induced emf v/s time graph for coil is:-

The radius of a circular coil having $50 \text{turns is} 2 \mathrm{cm}$. Its plane is normal to the magnetic field. The magnetic field changes from $2 \mathrm{T} \text{to} 4 \mathrm{T} \text{in} 3.14 \mathrm{s}$. The induced emf in coil will be,

Magnetic field changes at a rate of $0.4 \mathrm{T} {\mathrm{s}}^{-1}$ in a square coil of side $4 \mathrm{cm}$ kept perpendicular to the field. If the resistance of the coil is $2 x {10}^{-3} \Omega$, then induced current in coil is,

A short bar magnet is allowed to fall along the axis of a horizontal metallic ring. Starting from rest, the distance fallen by the magnet in one second may be,