Electric field inside a sphere varies with distance as A r. Find the total charge enclosed within the sphere, if A = 3,000 `V m^-2` and R = 30 cm, where R is radius of the sphere.

Electric field varies as r^-3 due to

The electric field in a region is radially outward and varies with distance r as E = 250 r Vm^-2 Calculate the charge contained in a sphere of radius 0.2 m centred at the origin.

The electric field at a distance 3R/2 from the centre of a charge conducting spherical shell of radius R is E. The electric field at a distance R/2 from the centre of the sphere is

Find the moment of inertia of a sphere about a tangent to the sphere, given the moment of inertia of the sphere about any of its diameters to be 2MR^2//5 , where M is the mass of the sphere and R is the radius of the sphere.

Find the volume of sphere whose radius is 3 cm

A copper wire 36m long with diameter 2 mm is melted to form a sphere. Find the radius of the sphere.

Two small charged metal sphere A and B are situated in a vaccum. The distance between the centres of the spheres is 12.0 cm, as shown in the fig. The charge on each sphere may be assumed to be a point charge at the centre of the sphere. Point P is a movable point that lies on the line joining the centres of the sphere and is distance x fromt he centre of sphere A. The variation with distance x fo the electric field strength E at point P as shown in the figure. State the evidence provided by in the fig for the statement that the spheres are conductors, the charges on the spheres are either both positive or both negative.

A right circular cylinder just encloses a sphere of radius r (see Fig. ). Find surface area of the sphere.

A small charged metal sphere is situated in an earthed metal box. Illustrates the electric field between the sphere and the metal box. The radius r of the sphere is 2.4 cm. The magnitude of the charge q on the sphere is 0.76 n C.

find the radius of a sphere whose surface area is 154 cm^(2)