Physics
In an AC generator, name the part which has the following functions:
(a) intensifies the magnetic field.
(b) maintains electrical contact between the rotating parts and the external circuit.
Related Questions
(a) Define natural vibrations.
(b) How is this vibration different from damped vibrations in terms of their amplitudes?
A metal piece of thermal capacity 40 JK-1, absorbs 800 J of heat. Calculate the rise in the temperature of this metal piece.
Give two differences between nuclear fission and nuclear fusion.
A monochromatic ray strikes the surface of identical prisms (A, B and C) at different angles of incidence. The diagram below shows their refracted rays. Study the path of these refracted rays and identify in which of the diagrams:
(a) the angle of incidence is maximum.
(b) the angle of incidence is minimum.
(c) the angle of incidence is equal to the angle of emergence.