Which of the following statement(s) is/are incorrect?
Options:
(a) Flux can be varied by changing any one or more of the term `B, A and theta`.
(b) Flux can also be altered by changing the shape of a coil (i.e. by shrinking it or stretching it) in a magnetic field.
(c) A gentle push on the magnet in magnetic field intiates the motion in magnet and its kinetic energy continuously increases without expanding any energy.
(d) When a bar magnet experiences a repulsive force due to the induced current, a person has to do work in moving the magnet. The energy spent by the person is dissipated by joule heating produced by the induced current.