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`.
The self-inductance of the coil is

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:

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:

Will an induced current be always produced whenever there is change of magnetic flux linked with a coil?

When the number of magnetic field lines through a closed loop changes ,an induced current flows in the coil. Is this statement true.

How does the self inductance of an air coil change, when an iron rod is introduced in the coil?