If the distance is halved and the charges of both particles are doubled, the force is as great.

The new force is 16 times of the initial force.

Explanation:

The electric force between charges is given by :

If the distance is halved, d' =d/2 and charges are doubles,

New force becomes,

So, the new force is 16 times of the initial force.

d eras and periods

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me