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A molecule of a substance has permanent dipole moment p. A mole of this substance is polarised by applying a strong electrostatic field E. The direction of the field is suddenly changed by an angle of 60^(@). If N is the Avogadro's nwnber the amount of work done by the field is ...... |
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Answer» <P>2 NpE For N mole : W = N p E ( 1- cos `theta`) `:. W = NP E 9 1 - cos 60^(@)]` ` :. W = NpE [ 1 -(1)/(2)]` `:. W = NpExx(1)/(2)` `:. W = (1)/(2) ` N pE |
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