Question

Five balls numbered 1,2,3,4,and 5 are suspended using separated threads. The balls (1,2),(2,4) and (4,1) show electrostatic attraction while balls (2,3) and (4,5) show repulsion. Therefore, ball 1 must be
A. Positively charged
B. Negatively charged
C. Neutral
D. Made of metal

Answer 1

Correct Answer - c
Let us consider `1` ball has any type of charge 1 and 2 must have different charges `2` and `4` must have different charges i.e., `1` and`4` must have same charges but electrostatics attraction is also present in `(1,4)` which is impossible.