Question

Which of the following statement(s) is/are incorrect?
(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.

!!!!!!!! please submit full solution !!!!!!!​

Answer 1

Answer:

D

Statement is not correct

Answer 2

The incorrect statement is (c).

• The magnetic flux is calculated as follows:
• $\phi = BAcos\theta$
• Where B is the magnetic field, A is the area and $\theta$ is the angle between the area and magnetic field.
• Hence, the flux can be changed by changing B, A, and $\theta$.
• Thus,  the option (a) and (b) are correct.
• Statement (c) violates the law of energy of conservation. Hence it is incorrect.
• Statement (d) is correct. This is in coordination with Lenz's law and the law of conservation of energy.

Therefore, the correct option is (c).