In solids,inter-atomic forces are

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(C) In solids,the inter-atomic forces are a combination of both attractive and repulsive forces.At large distances,the inter-atomic force is attractiv

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Combination of $(a)$ and $(b)$

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(C) In solids,the inter-atomic forces are a combination of both attractive and repulsive forces.At large distances,the inter-atomic force is attractive,which holds the atoms together.At very small distances,the inter-atomic force becomes strongly repulsive due to the overlapping of electron clouds,which prevents the atoms from collapsing into each other.Therefore,the equilibrium position of atoms in a solid is determined by the balance between these two forces.

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