Question

State the phenomena of self induction and mutual induction....and their coefficients also.....jin ko nhi aata wo answer mt krna nhi to...​

Answer 1

Answer:

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Explanation:

What is Self Induction?

When there is a change in the current or magnetic flux of the coil, an opposed induced electromotive force is produced. This phenomenon is termed as Self Induction. When the current starts flowing through the coil at any instant, it is found that, that the magnetic flux becomes directly proportional to the current passing through the circuit. The relation is given as:

ϕ= I

ϕ = L I

Where L is termed as self-inductance of the coil or the coefficient of self-inductance. The self-inductance depends on the cross-sectional area, the permeability of the material, or the number of turns in the coil.

The rate of change of magnetic flux in the coil is given as,

e = – dϕdt = – d(LI)dt

or e = – L dIdt

Self Inductance Formula

L=NϕI

Where,

L is the self inductance in Henries

N is the number of turns

Φ is the magnetic flux

I is the current in amperes

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What is Mutual Induction?

We take two coils, and they are placed close to each other. The two coils are P- coil (Primary coil) and S- coil (Secondary coil). To the P-coil, a battery, and a key is connected wherein the S-coil a galvanometer is connected across it. When there is a change in the current or magnetic flux linked with two coils an opposing electromotive force is produced across each coil, and this phenomenon is termed as Mutual Induction. The relation is given as:

ϕ = I

ϕ = M I

Where M is termed as the mutual inductance of the two coils or the coefficient of the mutual inductance of the two coils.

The rate of change of magnetic flux in the coil is given as,

e = – dϕdt = – d(MI)dt

e = – M dIdt

Mutual Inductance Formula

M=μ0μrN1N2Al

Where,

μ0 is the permeability of free space

μr is the relative permeability of the soft iron core

N is the number of turns in coil

A is the cross-sectional area in m2

l is the length of the coil in m