A cylindrical bar magnet is kept along the axis of a...

Name: Problem 1, Chapter 21: Master Resource Book in JEE Main Physics
Uploaded: 2022-01-14T15:38:32-08:00
Duration: 1 min 22 s
Channel: Varsha Aggarwal
Description: A cylindrical bar magnet is kept along the axis of a circular coil. The magnet is rotated about its axis such that north pole faces the coil. The induced current in the coil (a) is zero (b) is clockwise from magnet side (c) may be clockwise or anti-clockwise (d) is anti-clockwise from magnet side

A cylindrical bar magnet is kept along the axis of a circular coil. The magnet is rotated about its axis such that north pole faces the coil. The induced current in the coil (a) is zero (b) is clockwise from magnet side (c) may be clockwise or anti-clockwise (d) is anti-clockwise from magnet side

A cylindrical bar magnet is kept along the axis of a circular coil. The magnet is rotated about its axis such that north pole faces the coil. The induced current in the coil
(a) is zero
(b) is clockwise from magnet side
(c) may be clockwise or anti-clockwise
(d) is anti-clockwise from magnet side

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Key Concepts

Rotation About the Magnet's Axis

When a cylindrical bar magnet is rotated about its own symmetry axis, the orientation of its magnetic dipole with respect to the coil remains unchanged. Consequently, the magnetic flux through the coil does not vary, and according to Faraday's Law, no current is induced.

Faraday's Law of Electromagnetic Induction

This principle explains that an electromotive force (EMF) is induced in a circuit when there is a change in magnetic flux through the coil. The magnitude of the induced current depends on how quickly the flux changes, and if there is no change in flux, no current is induced.

Magnetic Flux

Magnetic flux quantifies the total magnetic field passing normally through a given surface area. It is calculated as the product of the magnetic field and the area perpendicular to the field lines, and variations in this flux are what drive the process of electromagnetic induction.

Magnetic Dipole Field

A bar magnet can be modeled as a magnetic dipole that produces a magnetic field in the surrounding space. The spatial distribution of this field is such that its component along a particular direction, like the axis of a coil, is determined by the orientation of the dipole.

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