Question

Please Explain each of them in 10 lines:

Please !!! If you write it in your handwriting, please be clear. answer all questions :)

§ how a changing magnetic field produces an electric field

§Inductance and give examples of applications and relevance

§ the concept of electro magnetic field in self induction, how is it generated

thank you,

Answer 1

a)If a coil of wire is placed in a changing magnetic field, a current will be induced in the wire. This current flows because  electromotive force, or emf is producing an electric field that forces the charges around the wire. ( magnetic force cannot produce electric field, since the charges are not initially moving).  Instead, emf is like the voltage provided by a battery. A changing magnetic field through a coil of wire therefore must induce an emf in the coil which in turn causes current to flow.

Faraday's law says that a changing magnetic field produces an electric field. If charges are free to move, the electric field will cause an emf and a current.

b) Inductance is the property of a component that opposes the change of current flowing through it and even a straight piece of wire will have some inductance.A current generated in a conductor by a changing magnetic field is proportional to the rate of change of the magnetic field. This effect is called INDUCTANCE.

Inductors are used in Induction motor,Filters,Sensors

c) Self inductance is defined as the induction of a voltage in a current-carrying wire when the current in the wire itself is changing.Inductors generates a self-induced emf within itself as a result of their changing magnetic field. In an electrical circuit, when the emf is induced in the same circuit in which the current is changing this effect is called Self-induction.
Magnetic field gives rise to magnetic flux ϕ passing through each turn in the coil. Coil having N turns will have flux Nϕ .
Magnetic field is proportional to the current i flowing through the coil and so is the flux.
Nϕ∝i
Nϕ=Li
L is the self inductance.
The rate of change of flux induces an emf (e) by Farady's law of electromagnetic induction.
e=−dtd(Nϕ)​=−dtd(Li)​=−Ldtdi​