Just after two identical point charges are released when they are a distance d apart in outer space, they have an acceleration a. if you release them from a distance d/2 instead, their acceleration will be?
a) a/4 b) a/2 c) 2a d) 4a

d) 4a

Explanation:

r = Distance

Electrostatic force is given by

It can be seen that the force is inversely proportional to distance

If the distance is reduced

So, the new acceleration will be four times the old acceleration

The answer is d) 4a

powerful computers now, not then

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete