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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`.
If inductors of inductances `L_1` and `L_2` are connected in parallel, the effective inductance is:

A

`(L_1L_2)/(L_1-L_2)`

B

`(L_1+L_2)/(L_1L_2)`

C

`L_1-L_2)/(L_1L_2)`

D

`(L_1L_2)/(L_1+L_2)`

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