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

  • A
    Positively charged
  • B
    Negatively charged
  • C
    Neutral
  • D
    Made of metal

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$(a)$ Explain the meaning of the statement 'electric charge of a body is quantised'.
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When $10^{14}$ electrons are removed from a neutral metal sphere,the charge on the sphere becomes ...... $\mu C$.

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