Question

An infinitely long cylinder is kept parallel to an uniform magnetic field B directed along positive z axis. The direction of induced current as seen from the z axis will be(a) Clockwise of the +ve z axis(b) Anticlockwise of the +ve z axis
(c) Zero(d) Along the magnetic field

Answer 1

answer : option (c) is correct

explanation : according to Faraday's law ,
" the induced electromotive force (emf) in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit. "

but here it is given that an infinitely long cylinder is kept parallel to an $\textbf{uniform magnetic field B}$ directed along positive z axis. so, the magnetic flux doesn't change. hence, induced emf will be zero.
therefore, no current will be induced.

hence, option (c) is correct.

Answer 2

according to Faraday's law ,

" the induced electromotive force (emf) in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit. "