Some types of molecules that do not possess an intrinsic electric dipole moment

Question

Some types of molecules that do not possess an intrinsic electric dipole moment can be given one by an net charge. Both charges have equal magnitudes and the electric neutrality of the molecule as a whole is field is canceled, the molecule reverts to its unpolarized state and loses its electric dipole moment pulled in the opposite direction. This charge separation endows the molecule with an electric dipole Find the charge separation distance in an electric field of 4.43 x105 N/O What is the magnitude of the induced electric dipole moment then?

Explanation / Answer

Given that,

q = 1.6*10^(-19) C

k = 4.45*10^(-4) N/m

E = 4.43*10^5 N/C

(a)

Let, charge separation distance = x,

From equilibrium of forces,

qE = kx

x = qE / k

x = 1.6*10^(-19)*4.43*10^5 / 4.45*10^(-4)

x = 1.59*10^(-10) m

(b)

lnduced elecric dipole moment,

P = q*x

P = 1.6*10^(-19)*1.59*10^(-10)

P = 2.54*10^(-29) C.m

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