A solid metal weighing 150 g melts at it's melting point of 800 °C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal?

Identify the following wires used in a household circuit:

(i) The wire is also called as the phase wire.

(ii) The wire is connected to the top terminal of a three-pin socket.

State any two advantages of electromagnets over permanent magnets.

(i) Derive a relationship between S.I. and C.G.S. unit of work.

(ii) A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force. What should be the value of θ to get the maximum positive work?