In Fig. infinite conducting rings each having current i in the direciton shown are placed concentrically in the same plane as shown in the figure. The radii of rings are `r,2r,2^2r,2^3r,......,(oo)`. The magnetic field at the centre of rings will be

A ring of the radius R is placed in the y - z plane and it carries a current i. The conducting wires which are used to supply the current to the ring can be assumed to be vary long and are placed as shown in the figure. The magnitude of the magnetic field at the centre of the ring A is

A ring of the radius R is placed in the y - z plane and it carries a current i. The conducting wires which are used to supply the current to the ring can be assumed to be vary long and are placed as shown in the figure. The magnitude of the magnetic field at the centre of the ring A is

A non conducting ring of radius R is charged as shown in figure : Figure

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

An infinite straigh conductor carrying current 2 I is split into a loop of radius r as shown in fig. the magnetic field at the centre of the coil is

In the figure shown there are two semicircles of radii r_(1) and r_(2) in which a current i is flowing. The magnetic induction at the centre O will be

In the figure shown there are two semicircles of radii r_(1) and r_(2) in which a current i is flowing. The magnetic induction at the centre O will be

In the figure shown there are two semicircles of radii r_(1) and r_(2) in which a current i is flowing. The magnetic induction at the centre O will be