Three circular concentric wires of radii a, 2a and 3a are carrying currents 3l, 2l and l in same manner. Find the magnetic field at the common centre.

The current-loop PQRSTP formed by two circular segments of radii R_(1) and R_(2) carries a current of I ampers. Find the magnetic field at the common centre O. what will be the field if angle alpha = 90^(@) ?

A wire of length L carrying a current I is bent into a circle. The magnitude of the magnetic field at the centre of the circle is

A wire of length L carrying a current I is bent into a circle. The magnitude of the magnetic field at the centre of the circle is

In the figure-4.30 shown two circular arcs are joined to make a closed loop carrying current l . Frnd the magnetic induction at the common centre 0.

A wire of length L carrying a current I is bent into a circle. The magnitude of the magneitc field at the centre of the circle is

Two concentric circular coils of five turns each are situated in the same plane. Their radii are 20 cm and 30 cm and they carry respectively 0.2 A and 0.3 A current in same direction. The magnetic field in tesla at the centre is

Two concentric circular coils of five turns each are situated in the same plane. Their radii are 20 cm and 30 cm and they carry respectively 0.2 A and 0.3 A current in same direction. The magnetic field in tesla at the centre is

Find the magnetic field induction at a point on the axis of a circular coil carrying current and hence find the magnetic field at the centre of circular coil carrying current.

Find the magnetic field induction at a point on the axis of a circular coil carrying current and hence find the magnetic field at the centre of circular coil carrying current.