Two charged parallel plate capacitors, each with separation between plates equal to $d$, are separated by a large distance $L >> d$. Then the force of interaction between them is proportional to
Medium
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For large separation capacitor can be treated as dipole and dipole moment $\propto$ $\mathrm{d}$
Force $\propto \frac{\mathrm{p}_{1} \mathrm{p}_{2}}{\mathrm{L}^{4}} \Rightarrow \mathrm{F} \propto \frac{\mathrm{d}^{2}}{\mathrm{L}^{4}}(\because \mathrm{p} \propto \mathrm{d})$
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