Questions in Electrostatics

Select	Question
	The law, governing the force between electric charges is known as
	When the distance between the charged particles is halved, the force between them becomes
	A charge \[{q_1}\] exerts some force on a second charge \[{q_2}\]. If third charge \[{q_3}\] is brought near, the force of \[{q_1}\] exerted on \[{q_2}\]
	\[{F_g}\] and \[{F_e}\] represents gravitational and electrostatic force respectively between electrons situated at a distance 10 cm. The ratio of \[{F_g}/{F_e}\] is of the order of
	The ratio of the forces between two small spheres with constant charge \[(a)\] in air \[(b)\] in a medium of dielectric constant K is
	A soap bubble is given a negative charge, then its radius
	Four charges are arranged at the corners of a square $ABCD$, as shown in the adjoining figure. The force on the charge kept at the centre O is
	In the absence of other conductors, the surface charge density
	A body can be negatively charged by
	The minimum charge on an object is

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