Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2) , (2, 4) and (4, 1) sh

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1. Electric Charges and Fields

medium

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

Positively charged

Negatively charged

Neutral

Made of metal

Solution

(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.

Standard 12

Physics