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Five balls numbered 1 to 5 are suspended...

Five balls numbered 1 to 5 are suspended using separate threads. Pairs (5,3), (3, 4) and (4, 5) show electrostatic attraction, while pairs (2, 3) and (4, 1) show repulsion. Therefore ball 5 must be

A

Positively charged

B

Negatively charged

C

Neutral

D

Made of metal

Text Solution

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The correct Answer is:
C
Let +ve or -ve charge on ball 1. According to question ball 1 and ball 2 must have different charges and ball 2 and ball 4 must have different charges. Hence ball 1 and ball 4 must have same charges but according to question pair (1, 4) also present electrostatic attraction which is impossible.
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