Inductance

If the current in the toroidal solenoid increases uniformly from zero to in Self inductance of the toroidal solenoid is . The magnitude of self induced emf is

Radii of two conducting circular loops are b and a respectively where b > > a. Centers of both loops coincide but planes of both loops are perpendicular to each other. The value of mutual inductance for these loops

The unit of self inductance is