An immersion heater is rated 120W. How long does it take the heater to raise the temperature of 1.2kg of water by 15oC. (Assuming heat lost to the surrounding is negligible. Specific heat capacity of water = 4200 Jkg-1K-1C)
The region around a magnet in which the magnetic influence is experienced is called
A device used to prevent wearing away of the make and-brake contacts of an induction coil is called a\an
If a bar magnet is accidentally broken into three pieces as shown in the diagram above, the polarities of P and Q respectively, are
An inductor of inductance 10H carries a current of 0.2A. Calculate the energy stored in the inductor
