PHYSICS

Electromagnetic induction is the phenomenon in which an electromotive force (e.m.f.) is induced in a conductor whenever there is a change in the magnetic flux linking the conductor. If the conductor forms a closed circuit, the induced e.m.f. produces an induced current. 2. Faraday's Experiment Michael Faraday discovered electromagnetic induction through experiments involving a coil, a galvanometer and a bar magnet. When a bar magnet is moved towards a coil, the galvanometer shows a deflection, indicating that current is produced. When the magnet is held stationary inside or near the coil, there is no deflection. When the magnet is moved away from the coil, the galvanometer deflects in the opposite direction. Conclusion An e.m.f. is induced only when there is a change in magnetic flux through the coil. 3. Magnetic Flux Magnetic flux is the total number of magnetic field lines passing normally through a given surface. It is represented by Φ (phi). The formula is: Φ = BA c...

An electromagnetic field is the field due to the interaction of  electric and magnetic forces on a charged body. An electromagnetic field consists of two closely related components: (i) Electric Field  An electric field is a region around a charged body in which another electric charge experiences a force. It is represented by E and its S.I. unit is newton per coulomb (N C⁻¹) or volt per metre (V m⁻¹). Force on a Current-carrying conductor in a magnetic field  The force, F on the wire is proportional to: (I) Current, (I), flowing in the conductor  (II) the length, (L), of the conductor in the field. (III) the magnetic flux density (B) (IV) the sine of the angle,(θ) between the conductor and the field. When a current-carrying conductor is placed in a magnetic field, it experiences a force. The force is given by: F = BILsin θ Example : The force experienced by a current carrying conductor of length 100cm is 2.0N. Calculate the current in...