ELECTROMAGNETIC INDUCTION
1.
φ B = B . A = BA cos ᴓ
Here
φ B = Magnetic flux
B = Magnetic induction
A = Area vector
2.
1 weber = 1 tesla metre2
3.
1 Maxwell = 1 Gauss centimetre2
4.
Faraday’s laws which gives us the magnitude of induced EMF.
5.
Lenz’s law which gives us the direction of induced EMF.
6.
Faraday’s laws of electromagnetic
induction –
v Whenever the magnetic flux linked with a
closed circuit changes, an EMF is induced in this circuit.
v The magnitude of induced EMF is equal to the
negative rate of change of magnetic flux linked with the closed circuit.
E = - dφB /
dt
7. Lenz’s law –
v It states that the direction of induced EMF is
such that it opposes the cause which produces it, i.e., it opposes the change
in magnetic flux.
E = - dφB /
dt
v Lenz’s law obey the principle of conservation
of energy.
8. Fleming’s Right hand rule / Dynamo rule / Generator rule –
Mars
Malow Industry – M M I ( Trick for Remember)
M –
Direction of Motion of conductor – Thumb
M –
Direction of magnetic field – Fore finger
I –
Direction of current – Central finger
9. Eddy currents are the currents
induced in solid metallic masses when magnetic flux threading through them
changes. Eddy currents are also known as Foucault current.
10. φB = L I
Here φB = Magnetic flux
L = Coefficient of self induction
I = Current
11. E = - L dI / dt
12. S.I. unit of self inductance is
Henry.
13. φB = M I
Here M = Coefficient of mutual
inductance
14. S.I. unit of mutual inductance is
Henry.
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