Embibe Experts Solutions for Chapter: Electromagnetic Induction, Exercise 1: assam board-2018

Briefly explain working of a.c. generator.

Define mutual induction of $1 \mathrm{Henry}$.

Explain Lenz's law from the conservation of energy

The phenomenon of electromagnetic induction has been technologically important application in the generation of alternating currents." Name the device which can generate alternating currents. Draw a neat diagram of it.

 A rectangular coil having an area vector $\overline{\mathrm{A}}$ and number of turns $\mathrm{N}$ is rotating in a magnetic field $\overline{\mathrm{B}}$ with angular speed $\omega$. If $\theta$be the angle made by the area vector $\overline{\mathrm{A}}$ with the field $\overline{\mathrm{B}}$ at time $t$. Derive an expression for alternating emf $\epsilon$ starting directly from Faraday's law. Draw a graph to show the generated e.m.f at the time   $0 ,\frac{\mathrm{T}}{4}.\frac{\mathrm{T}}{2},\frac{3\mathrm{T}}{4}\mathrm{and} \mathrm{T}$.

In a circuit current decrease from $5A$ to $0A$ is $0·1s$. If the average induced e.m.f is $200v$, calculate the self inductance of the circuit and write is unit.

What do you mean by electromagnetic induction? Name the two great experimentalists who carried long series of experiments on electromagnetic induction. You are given two coils one galvanometer, one battery and some connecting wires. Describe a experiment that can show the production of electromagnetic induction.

What is motional emf, Deduce an expression for it from the following diagram. If $\mathrm{R}$ be the resistance of the loop $\mathrm{PQRS}$ at agiven instant, what will be induced current at that instant?

A straight conductor of length $0.1 \mathrm{m}$  moves with a speed of $10 {\mathrm{ms}}^{-1}$ perpendicular to the magnetic field of induction $1 \mathrm{web}/{\mathrm{m}}^2$. Calculate the induced e.m.f. State Len's law.

Draw a labelled diagram of an AC generator. Show that it produces sinusoidal e,m,f, or current. What is the frequency of rotation in India,