## Explain different ways to induce current in a coil

Q. What is the role of the split ring in an electric motor?   Answer:- The different ways to induce current in a coil are as follows: (i) Moving a magnet…

## What is the principle of an electric motor

Q. What is the principle of an electric motor   Answer:- The principle of an electric motor is based on the magnetic effect of electric current. A current-carrying loop experiences…

## State Fleming’s left-hand rule

Q. State Fleming’s left-hand rule   Answer:- According to Fleming’s left hand rule if we stretch the thumb, the centre finger and the middle finger of our left hand such…

## Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?

Q.16:- Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?   Answer:- For T.V set Power (P) = 250w, Time…

## An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Q.17:- An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.   Answer:- Here…

## Explain the following. (a) Why is the tungsten used almost exclusively for filament of electric lamps? (b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

Q.18:- Explain the following. (a) Why is the tungsten used almost exclusively for filament of electric lamps? (b) Why are the conductors of electric heating devices, such as bread-toasters and electric…

## Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply

Q.15:- Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from…

## Compare the power used in the 2 Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1 Ω and 2 Ω resistors, and (ii) a 4 V battery in parallel with 12 Ω and 2 Ω resistors.

Q.14:- Compare the power used in the 2 Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1 Ω and 2 Ω resistors, and…