# Rotation of an electric dipole in a field and emission of photon

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A point dipole with p0 = 10-12 [C m] is fixed at the origin of a Cartesian coordinate system and points up. Four, N = 4, little dipoles with p = 10-15 [C m] each and pointing radially away from p0 are uniformly distributed on a horizontal circle of radius R = 1 [cm] as shown in the Figure below. The little dipoles are allowed to rotate until they assume the equilibrium orientation. During this process each little dipole emits a photon. Your task is to determine:

a)

The initial and final dipole moments 푝퐴beforeand 푝퐴afterof the little dipole at location A.

b)

The frequency, f, of each of the emitted photons.

c)

The total emitted energy, 퓔 total.

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##### Solution Summary

A point dipole is generating an electric field and a four little dipoles are placed radially. The little dipole rotates when released and emits a photon. The frequency of photon, energies, fields and their directions are calculated.

##### Solution Preview

Please see the attached file.

Distance of the little dipole A from P0 is

r=R/sin〖〖45〗^0 〗 =1/(1/√2)= √2 cm=1.414*〖10〗^(-2) m

The magnitude of the electric field at distance r from a point dipole P in the direction with the dipole is given by

E=P/(4πϵ_0 r^3 ) √(1+3 cos^2θ )

Thus magnitude of electric field at position of dipole A due to dipole P0 will be

E=P_0/(4πϵ_0 r^3 ) √(1+3 cos^2〖〖45〗^0 〗 )

Or E=(〖10〗^(-12)*9*〖10〗^9)/(1.414*〖10〗^(-2) )^3 √(1+3 cos^2〖〖45〗^0 〗 ) = 3.18*103*1.58 = 5.02*103 N/C

This is the magnitude of the field at position of dipole A and its direction is making angle ...

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