An infinitely long straight current carrying wire produces a magnetic field B at a point at a distance 'a' from it. What must be the radius of the circular loop, so that for the same current through it the magnetic field at (i) its dentre equals B/2

An infinitely long straight current carrying wire produces a magnetic field B at a point at a distance 'a' from it. What must be the radius of the circular loop, so that for the same current through it the magnetic field at (II) an axial point, distant equal to the radius of the loop equals B?

Find an expression for the magnetic field at a point on the axis of a circular current loop.

Find an expression for the magnetic field at points on the axis of a circular current loop.

A circular coil of wire consisting of 80 turns, each of radius 50 mm carries a current of 0.25 A. What is the magnetic field at the centre of the coil?

What will be the magnetic field at a point on the axis of a long solenoid containing 10 turns per cm length, when a current of 1 ampere flows through it ?

What is the magnetic field at a point placed outside of a long solenoid carrying current I.