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A water molecule has an electric dipole ...

A water molecule has an electric dipole moment `6.4xx10^-30 Cm` when it is in vapour state. The distance in metre between the centre of positive and negative charge of the molecule is

A

`4**10^-10`

B

`4**10^-11`

C

`4**10^-12`

D

`4**10^-13`

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