When the distance between two charged particles is halved, the force between them will become

When the distance between two charged particles is halved, the force between them becomes four times.

When the distance between two charged particles is doubled, the force between them becomes

When the distance between two charged particles is doubled, the force between them becomes:

When the distanc ebetween the charged particles is halved the force between them becomes

When distance between two given magnetic poles is halved, force between them becoems k times, where k=

If the distance between two particles is halved, the gravitional force becomes

The gravitational force between two bodies is F. If the mass of each body is doubled and the distance between them is halved , them the force between them will be