An infinite number of concentric rings carry a charge `Q` each alternately positive and negative. Their radii are `1, 2, 4, 8..` meters in geometric progression as shown in the figure. The potential at the centre of the rings will be

Positive and negative charges of 1 muC each are placed at two points as shown in the figure. Find the potential difference between A and B

Positive and negative charges of 1 muC each are placed at two points as shown in the figure. Find the potential difference between A and B

Positive and negative charges of 1 muC each are placed at two points as shown in the figure. Find the potential difference between A and B

A charge Q is distributed uniformly on a ring of radius R as shown in the following diagrams. Find the electric potential at the centre O of the ring

A ring of radius r has a uniformly spread charge + q on quarter of its circumference. The opposite quarter of the ring carries a charge – q uniformly spread over it. Find the electric potential at a point A shown in the figure. Point A is at a distance R(gtgt r) from the centre of the ring.

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

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

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