Question

What do you mean by electromagnetic induction? Find a formula for EMF induced in a coil rotating in a uniform magnetic field.

Answer 1

Answer:

When the normal to the coil is at an angle θ to the field the flux through the coil is BAN cosθ = BAN cos(ω)t, since θ = ωt. Therefore the e.m.f E generated between the ends of the coil is: E = -d(φ)/dt = -d(BANcosθ)/dt.

Explanation:

Answer 2

Electromagnetic induction is the production of potential difference (current) across a circuit when the circuit comes under the influence of variable magnetic field.

Explanation:

Variable magnetic field means that the magnet is changing its position continuously as it is in motion.

Current can be generated from the magnetic field and the force, according to Faraday's law.

E.M.F induced in a coil is,

                                ⇒ E = $\frac{d}{dt}$ x Ф

where, Ф is the magnetic flux and t is the time period.