The interaction energy of London forces between two particles is proportional to , where r is the distance between the particles. The value of x is:

Question

Canvas Classes · Accepted Answer

London dispersion forces (induced dipole–induced dipole interactions) arise from temporary fluctuations in electron distribution.

Step 1 — Energy dependence on distance:
The interaction energy of London forces is given by:

where C is a constant depending on polarisability.

Step 2 — Identify x:
Comparing with :

Note: The negative sign indicates attractive interaction (energy decreases as molecules approach), and the r⁻⁶ dependence means London forces are very short-range.

Answer: Option (2)

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