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Self inductance or coefficient of self i...

Self inductance or coefficient of self induction
Whenever an electric flowing through a coil changes, the magnetic flux linked with the circuit also changes. And an induced emf is produced in the circuit. This phenomenon is called self-induction. The magnetic flux linked with the coil `(phi)` is proportional to the current (I) flowing in te circuit i.e. `phi propto I`.
Inductors of inductance `L_1` and `L_2` are connected in series. The effective inductance is:

A

`(L_1)/(L_2)`

B

`L_2)/(L_1)`

C

`L_1+L_2`

D

`L_1-L_2`

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