ELECTROMAGNETIC INDUCTION (MEMORY CAPSULE )

                                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 = - dφ_B / 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 = - dφ_B / 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. φ_B = L I

Here φ_B = Magnetic flux

         L = Coefficient of self induction

         I = Current

11. E = - L dI / dt

12. S.I. unit of self inductance is Henry.

13. φ_B = M I

Here M = Coefficient of mutual inductance

14. S.I. unit of mutual inductance is Henry.

https://jayphy.blogspot.com/2020/07/moving-charges-and-magnetism-memory.html