In a regular polygon of `n` sides, each corner is at a distance `r` from the centre. Identical charges each of magnitude `q` are placed at corners. The field at the centre is

In a regular polygon of n sides, each corner is at a distance r from the centre. Identical charges of magnitude Q are placed at (n-1) corners. The field at the centre is

In a regular polygon of n sides, each corner is at a distance r from the centre. Identical charges are placed at (n-1) corners. At the centre, the intensity is E and the potential is V . The ratio V//E has magnitude

In a regular polgyon of n sides, each cormer is at a distance r from the center . Identical chargs are placed at ( n-1) corners . At the center, the intensity is E and the potential is VM . The ratio V//E has magnitude .

A loop carrying current I has the shape of a regular polygon of n sides. If R is the distance from the centre to any vertex, then the magnitude of the magnetic induction vector vec(B) at the centre of the loop is –

If a regular polygon of n sides has circum radius R and inradius r then each side of polygon is:

At the eight corners of a cube of side 10 cm, equal charge each of value 10 C are placed. Calculate the potebtial at the centre of the cube.

A regular pentagon has four charges each +q at four of its vertices. At the centre of the pentagon, a charge +q is kept. If the distance of a vertex from the center is a the magnitude of the net force acting on the charge at the center is

At each corner of an equilateral triangle identical charges are placed. Then at the centre of the triangle

A sphere of radius R carries charge such that its volume charge density is proportional to the square of the distance from the centre. What is the ratio of the magnitude of the electric field at a distance 2 R from the centre to the magnitude of the electric field at a distance of R//2 from the centre?