R P Goyal and S P Tripathi Solutions for Chapter: Electro-Magnetism, Exercise 3: EXERCISE-10(C)

In which of the following case does the electromagnetic induction occur?

A conductor is moved in a varying magnetic field. Name the law which determines the direction of current induced in the conductor.

Name the device used to transform $12 \mathrm{V} \mathrm{a}.\mathrm{c}$ to $200 \mathrm{V} \mathrm{a}.\mathrm{c}$. Name the principal on which it works.

In a step-up transformer, the number of turns in the primary are _____ than the number of turns in the secondary.

The transformer is used in _____ current circuits.

The primary coil of a transformer has $800$ turns and the secondary coil has $8$ turns. It is connected to a $220 \mathrm{V}$ a.c. supply. What will be the output voltage?

A transformer is designed to work from a $240 \mathrm{V}$ a.c. mains and to give a supply of $8 \mathrm{V}$ to ring a house–bell. The primary coil$4800$ turns. How many turns will be in the secondary coil?

The input and output voltages of a transformer are $220 \mathrm{V}$ and $44 \mathrm{V}$ respectively. Find : the current in input circuit if the output current is $2 \mathrm{A}$.