Question

Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (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

The correct option is C Neutral

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.