Electric Charge...

The constant k in Coulomb's law depends on

Which of the following statement is not a similarity between electrostatic and gravitational forces?

SI unit of permittivity of free space is

The force between two small charged spheres having charges of 1 x 10^-7 C and 2 x 10^-7 C placed 20 cm apart in air is

The nucleus of helium atom contains two proton that are separated by distance 3.0 x 10^-15 m. The magnitude of the electrostatic force that each proton exerts on the other is

Two insulated charged metallic spheres P and Q have their centres separated by a distance of 60 cm. The radii of P and Q are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is 3.2 x 10^-7 C is

Two point charges of +3 μC and +4 μC repel each other with a force of 10 N. If each is given an additional charge of -6 μC, the new force is

The ratio of magnitude of electrostatic force and gravitational force for an electron and proton is

The electrostatic attracting force on a small sphere of charge 0.2μC due to another small sphere of charge -0.4μC in air is 0.4N. The distance between the two spheres is

Under the action of a given coulombic force the acceleration of an electron is 2.5 x 10²² ms^-2. Then the magnitude of the acceleration of a proton under the action of same force is nearly