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Molecular mass of water = 18 gm
18 gm of water contains 6.023 X 1023 molecules
18/103 m3 of water contains 6.023 X 1026/18 molecules
Volume of water drop = 4π/3 X (10-3)3 m3
No of molecules in the drop, N = 6.023 X 1026 X 4π X 10-9/18 X 3
= 1.4 X 1017 m-3
Polarization, P = Np
= 1.4 X 1017 m-3 X 6 X 10-30 m
= 8.4 X 10-13 m-2.
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