Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magneic field passing through the loop increases or decreases.

A current l flows through a closed loop as shown in figure .The magnetic field at the centre O is

A current l flows through a closed loop as shown in figure .The magnetic field at the centre O is

A metallic loop is placed in a magnetic field. If a current is passed through it, then

Obtain for the magnetic induction, vector at a point on the axis of a circular loop of radius r, at a distance x. If i be the current passing through the loop then draw the lines of the forces for the magnetic field.