The current through the wire is 10 A as shown in figure below. Find magnetic field intensity at the point O of the circular part. The radius of the circular part is 3 cm.

Magnetic field intensity H at the centre of a circular loop of radius r carrying current I e.m.u is

Find the electric field intensity at the centre of a semi circular arc of radius r, uniformaly charged with a charge q.

A wire of length 'I' is bent in the form a circular loop. With a number of turns and is suspended in a magnetic field of intensity B. Find the expression for the maximum torque produced on the circular loop when a current 'I' is passed through it.

A rectangular wire of length 18 cm and breadth 15 cm is bent into a circular wire. Then find the radius of this circular wire.

A rod of length 'L' is bent in the form a circular loop with a number of turns and is suspended in a magnetic field of intensity B. Find the expression for the maximum torque produced on the circular loop when a current ' I ' is passed through it.

Using Bio-Savart law determine the magnetic field at any point on the axis of a current carrying circular loop.

A thread carrying a uniform charge lambda per unit length has the configuration as shown in figure. If radius ‘R’ is considerably length 'the length of the thread then find the magnitude of the electric field strength at the point O. (O is the centre of the quarter circular arc).