Embibe Experts Solutions for Chapter: Electromagnetic Induction, Exercise 1: Exercise 1

A field of $\frac{5\times {10}^4}{\mathrm{\pi }}$ ampere-turns per meter acts at a right angle to a coil of $50$ turns of area ${10}^{-2} {\mathrm{m}}^2$. The coil is removed from the field in $0.1$ second. Then the induced emf in the coil is

Choke coil works on the principle of

The magnetic flux through a circuit of resistance $R$ changes by an amount $\mathrm{\Delta \varphi }$ in time $\mathrm{\Delta }t$. Then the total quantity of electric charge $Q$ that during this time passes at any point of the circuit is given by 

The mutual inductance of a pair of coils is $0.75 \mathrm{H}$. If the current in the primary coil changes from $0.5 \mathrm{A}$ to $0$ in $0.01 \mathrm{s}$, then the average induced e.m.f. in the secondary coil is

Three inductances $L_1=0.75 \mathrm{H}$, $L_2=L_3=0.5 \mathrm{H}$ are connected as shown below. Assuming no coupling, the resultant inductance will be

Induction furnace makes use of

Two induction coils of inductance $L_1$ and $L_2$ are separated by a considerable distance. On connecting them in series, the equivalent inductance will be

An induced emf has