The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in air is 0.2 N. (a) What is the distance between the two spheres? (b) What is the force on the second sphere due to the first?

The diameter of two sphere are in the ratio 1:2 , what is the ratio between their total surface area.

What is the force of repulsion if each sphere charged double the above the amount and the distance between them is halved ?

A charged metallic sphere A is suspended by a nylon thread. Another charged metallic sphere B held by an insulating handle is brought close to 'A' such that the distance between their centres is 10cm as shown in the figure (a). The resulting repulsion of A is noted (for example, by shining a beam of light and measuring the deflection of its shadow on a screen). Spheres A and B are touched by uncharged spheres C and D respectively as shown in the fig (b). C and D are then removed and B is brought closer to A to a distance of 5.0cm between their centres as shoen in the fig(c). What is the expected repulsion of A on the basis of Coulomb's law? Spheres A and C and spheres B and D have identical sizes. Ignore the sizes of A and B in comparison to the separation between their centres. '(##VPU_HSS_PHY_XII_CO1_E01_005_Q01##)'

Given two point charges q1 and q2 , such that q1q2<0. What is the nature of force between them?

A uniformly charged conducting spheres of 2.4m diameter has a surface charge density of 80.0mu Cm^-2 ?.What is the total electric flux leaving the surface of the sphere?

What is the force between two small charged spheres having charges of 2x10^-7C and 3x10^-7C placed 30cm apart in air?