In this problem, you are to determine how the van der

Chapter , Problem 40

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In this problem, you are to determine how the van der Waals force between a polar molecule and a nonpolar molecule depends on the distance between the molecules. Let the polar molecule be at the origin and let its dipole moment be in the direction. In addition, let the nonpolar molecule be on the axis a distance x away. (a) How does the electric field strength due to an electric dipole vary with the distance from the dipole in a given direction? (b) Use (1) that the potential energy of an electric dipole of dipole moment in an electric field can be expressed as and (2) that the induced dipole moment of the nonpolar molecule is in the direction of and that is proportional to to determine how the potential energy of interaction of the two molecules depends on the separation distance (c) Using determine how the force between the two molecules depends on distance.