An inductor of inductance L carries an electric current i. How much energy is stored while establishing the current in it ?

An inductor of self inductance 12 H carries a steady current of 2A. How can a 60V self-induced e.m.f. be made to appear in the inductor?

How electric current is produccd in Thermal power stations?

A wire of length l is bent in the form of an equilateral triangle and carries an electric current i. (a) Find the magnetic field B at the centre. (b) If the wire is bent in the form of a square, what would be the value of B at the centre?

Consider a coaxial cable which consists of an inner wire of radius a surrounded by an outer shell of inner and outer radii b and c respectively. The inner wire carries an electric current (i_0) and the outer shell carries an equal current in opposite direction. Find the magnetic field at a distance x from the axis where b.

A circular loop of radius r carries a current i. where should a long , straight wire carrying a current 4i be placed in the plane of the circle so that the magnetic field at the centre becomes zero?