Write limitations of Coulomb’s law.

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$(1)$ Charges should be point charges.

$(2)$ Charges should be at rest.

$(3)$ Distance between charges should be greater than $10^{-15} \mathrm{~m}$ (nuclear radius).

$(4)$ Distance between charges should be less than $10^{18} \mathrm{~m}$.

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[Given : $4 \pi \varepsilon_{0}=\frac{1}{9 \times 10^{9}} SI$ unit]

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