Good reflector of heat
Non-absorber of heat
Good absorber and good radiator of heat
Bad absorber and bad radiator of heat
The earth-wire of a cable is attached to
The earth-wire of a cable is connected to
The earth’s magnetic field always has a vertical component except at the
The earthing transformer is used
The efficiency of a transformer is usually of the order of
The ejection of electrons when a metal surface is irradiated is called
The electric current in a metal wire is due to the flow of -
The electric motor converts
The electrical domestic tube light gives white fluorescent light because of
The electron was first identified by