A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________?
A10 times greater than before
B5 times greater than before
C5 times smaller than before
D25 times larger than before
Correct answer
D. 25 times larger than before
Explanation
The correct answer is 25 times larger than before.