Questions in Electrostatics

Select	Question
	Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons
	A total charge Q is broken in two parts \[{Q_1}\] and \[{Q_2}\] and they are placed at a distance \[R\] from each other. The maximum force of repulsion between them will occur, when
	Three charges \[4q, Q\] and \[q\] are in a straight line in the position of 0, \[l/2\] and \[l\] respectively. The resultant force on \[q\] will be zero, if \[Q = \]
	An isolated solid metallic sphere is given \[ + Q\] charge. The charge will be distributed on the sphere
	Two small spheres each having the charge \[ + Q\] are suspended by insulating threads of length \[L\] from a hook. This arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each will be
	Two charges each of \[1\;coulomb\]are at a distance \[1\,km\] apart, the force between them is
	\[ + 2C\] and \[ + 6C\] two charges are repelling each other with a force of \[12\,N\]. If each charge is given \[ - 2C\] of charge, then the value of the force will be
	Dielectric constant of pure water is 81. Its permittivity will
	There are two metallic spheres of same radii but one is solid and the other is hollow, then
	In general, metallic ropes are suspended on the carriers which take inflammable material. The reason is