JAMB Physics 2022 Paper

Concept:Magnetic flux is the measure of the total magnetic field passing through a given area.Explanation:For a uniform magnetic field of strength $B$ passing through an area $A$, the flux depends on the angle $\theta$ between the field and the normal to the surface.The scalar product form gives $\Phi = BA\cos\theta$.Option C matches this expression.Option A is the magnetic force on a moving charge.Option B is the magnetic field around a current-carrying conductor.Option D represents induced electromotive force from Faraday's law.Answer:C. $BA\cos\theta$