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 ______.

Options

• clockwise of the +ve z axis

• anticlockwise of the +ve z axis

• zero emf

• along the magnetic field

Answer 1

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 zero emf.

Explanation:

According to Faraday’s Law, an electromotive force (emf) and a resulting induced current are only produced when there is a change in magnetic flux (Φ) over time:

`ε = -(dphi)/(dt)`

Because the magnetic flux is not changing `((dphi)/(dt) = 0)`, the induced emf is zero. If there is no emf, there is no induced current.