Can you draw a line on the surface of a sphere which lies wholly on it?

Find the surface area of a sphere of radius 7cm.

A chain of length l and mass m lies on the surface of a smooth sphere of radius R>l with one end tied to the top of the sphere.

Find the surface area of a sphere of radius 14cm.

Find the surface area of a sphere of radius 7 cm.

Which of the following is the ratio of the surface area of the sphere with radius r to its volume?

Imagine a short diploe at the center of a spherical surface. If the magnitude of the electric field at a certain point on the surface of he sphere is 10NC^(_1) then which of the following cannot be the magnitude of the electric field anywhere on the surface of the sphere?

Two equipotential spherical surface having potential 20V and 0V are as shown in figure. There is no charge anywhere in space except on the surface of both the spheres. Then which of the following figure represents the nature of electric field in region between the spherical surfaces by electric lines of forces.

Two equipotential spherical surface having potential 20V and 0V are as shown in figure. There is no charge anywhere in space except on the surface of both the spheres. Then which of the following figure represents the nature of electric field in region between the spherical surfaces by electric lines of forces.

A parallel beam of light emerges from the opposite surface of the sphere when a point source of light lies at the surface of the sphere. The refractive index of the sphere is

If a charge is enclosed by the surface of the sphere then total flux emitted from the surface will be: