Physics Times 07.2019

(Kiana) #1
(II) Equivalent inductance(when M0)
When fluxes support each other
L L L M   1 2 2
When fluxes oppose each other

L L L M   1 2 2
where M- Mutual inductance
M K L L 1 2, K- Coupling constant


  1. Coupling constant(K)


K 1
Ideal coupling(Coaxial fashion)

0  K 1, M K L L 1 2

If d- decreases  K 1

No coupling,

(^) K   0 M 0
No coupling, (^) K   0 M 0
Unless it is specified always assume that M=0



  1. Coupling constant(K)

  2. LC Oscillations15. LC Oscillations
    A charged capacitor C is connected to an inductor L, the charge and current in the circuit start oscillating
    simple harmonically.


Energy in the capacitor is

(^22) cos^2
2 2
o
C
q q t
U
C C

 

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