Question

for coulomb force to be operative the least size of atom will be

Answer 1

Answer:

At least 10^-16 m

Explanation:

The electric force is operative between charges down to distances of at least 10-16 metre, or approximately one-tenth of the diameter of atomic nuclei.

Answer 2

for coulomb force to be operative the least size of the atom will be in order of $10^{-15}meters$.

Nuclear force is effective within the nuclear diameter. In a nucleus, the protons which has positive charge and the neutrons which are electrically neutral co-exists in an extremely confined space (≈$10^{-15}meters$). There are some forces acting within the nucleus which holds the nucleons together. As per Coulombs law, these forces are $F=k\frac{q_1q_2}{r^2}$. They acts at extremely short range which means these forces are effective for very short distance only i.e within the nuclear diameter $=10^{-15}meters$.

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