Question

Define (i) magnetic flux
induction. State their SI units.
(ii) magnetic​

Answer 1

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(I) Magnetic flux: The number of magnetic field lines passing through a surface, held perpendicular to the lines, is called the magnetic flux through the surface.

[Note: Magnetic field lines were earlier called as magnetic lines of force.]

SI unit: the weber, 1 Wb = 1 N.m/A, named in honour of Wilhelm E. Weber (1804 - 91) German physicist.

(ii) Magnetic induction : The magnitude of the magnetic induction at a point in a magnetic field is defined as the magnetic flux density (the magnetic flux per unit area) across an infinitesimal surface, containing the point, at right angles to the magnetic field lines.