When is the magnetic flux linked with a coil held in a magnetic field zero?

The self inductance of an inductor having 100 turns is 20 mH. Calculate the total magnetic flux linked with the coil and the magnetic flux through the cross-section of the inductor corresponding to a current of 4 mA.

The SI unit of magnetic flux is :

Define the term magnetic flux.

SI unit of magnetic flux 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 . The self-inductance of the coil is