Why does the charge flow from inner sphere to outer sphere?

A spherical conductor of radius 12cm has a charge of 1.6x10^(-7) C distributed uniformly on its surface. What is the electric field a) Inside the sphere. b) Just outside the sphere. c) At point 18cm from the centre of the sphere?

A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is 1.5 xx 10^3N//C and points radially Inward, what Is the net charge on the sphere?

Two charged spheres when placed in air attract with a force F. Keeping the distance between the charges constant, the spheres are immersed in a liquid of relative permittivity K. Then the spheres will