Electric Charge...

A large sphere of charge +Q is fixed in position. A smaller sphere of charge +q is placed near the larger sphere and released from rest then choose the correct option, smaller sphere will move with:

Two particles A & B having charges $$+q$$ and $$-2q$$. What happens to Electrostatic force between them if the distance between the A & B is halved?

Two charged spheres are kept apart by $$2 mm$$. Identify which of the following set of charges would yield the greatest attractive force between two spheres? 

What happens to the force between two charged particles when they are moved $$50$$% closer to one another?

Which of the following is true when the distance between two point charges is halved?

Two point charges $$+8\mu C$$ and $$+12\mu C$$ repel each other with a force of $$48\ N$$. When an additional charge of $$-10\mu C$$ is given to each of these charges (the distance between the charges is unaltered), then the new force is:

A Gaussian surface in the cylinder of cross section $$\displaystyle \pi { a }^{ 2 }$$ and length $$L$$ is immersed in a uniform electric field $$\displaystyle \overline { E } $$ with the cylinder axis parallel to the field. The flux $$\displaystyle '\phi '$$ of the electric field through the closed surface is:

The electric force between two point charges separated by a certain distance in air is $$F$$ the distance at which they should be placed in a medium of relative permittivity $$k$$ so that the force remain the same is:

The force between two point charges is F, which of the following could be done to make the force between them 1/2 F?

Two masses $${M}_{1}$$ and $${M}_{2}$$, which have a charge $${Q}_{1}$$ and $${Q}_{2}$$, respectively are placed at a distance $$r$$ initially.
If there is no other force acting on the charged particles and they remain at a distance $$r$$ apart indefinitely, identify which of the following must be true?