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A dipole consists of an electron and a ...

A dipole consists of an electron and a proton separated by a distance of `5xx 10^(-9)m`. The dipole is aligned in a uniform electric field of `1.44xx10^(4) N//C`. Calculate potential energy of dipole to hold it at `60^(@)` with the direction of electric field.

Text Solution

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Here `q = 1.6xx10^(-19) C , 2a = 5xx10^(-9) m`.
`theta_(1) = 0^(0) , E = 1.44xx10^(4) N//C, PE = ? theta_(2) = 60^(@)`
`P.E. = pE(cos theta_(2) - cos theta_(1)) = -qxx2aE (cos theta_(2) - cos theta_(1))`
`= 1.6xx10^(-19)xx5xx10^(-9)xx1.44xx10^(4) (cos 60^(@) - cos 0^(@))`
`= 8xx1.44 ((1)/(2) - 1) xx10^(-24)J
P.E. = 5*76xx10^(-24)J`
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