A circular ring is of breadth 5 cm. Then the difference between ex-radius and in-radius of the ring is

Two thin wire rings each having a radius R are placed at a distance d apart with their axes coiciding. The charges on the two rings are +q and -q . The potential difference between the centres of the two rings is

Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and -q . The potential difference between the centres of the two rings is

A charge q is uniformly distributed over a quarter circular ring of radius r . The magnitude of electric field strength at the centre of the ring will be

A circular conducting ring of radius 'a' is rolling with slipping on a horizontal surface as shown. A uniform magnetic field B is existing perpendicular to the plane of motion of the ring. The emf iniduced between the points A and D of the ring is

A circular conducting ring of radius 'a' is rolling with slipping on a horizontal surface as shown. A uniform magnetic field B is existing perpendicular to the plane of motion of the ring. The emf iniduced between the points A and D of the ring is

If the difference between the outer radius and the inner radius of a ring is 14 cm, then what is the difference between is outer circumference and innner circumference?

A conducting circular ring is rotated with angular velocity omega about point A as shown in figure. Radius of ring is a find a. potential difference between points A and C b. potential difference the points A and D .

The area of a ring is 22 cm^(2) . What is the difference of the square of the outer radius and the square of the inner radius?