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An electric dipole consists of two oppos...

An electric dipole consists of two opposite charges each of magnitude` 1 mu c ` separated by 2 cm. The dipole is placed in an external electric field of ` 10 ^(5) N C ^(-1)`
Find
The work the external agent will have to do in turning the dipole through ` 180^(@)` starting from the position ` theta = 0^(@)`

Text Solution

Verified by Experts

Given:
` p = q xx 2 l = 10 ^(-6) xx 2 xx 10 ^(-2) = 2 xx 10 ^(-8) cm
E = 10 ^(5) NC^(-1)`
`W = p E ( cos theta_(1) - cos theta_(2))`
`= 2 xx 10^(-8) xx 10 ^(5) xx ( cos 0 - cos 180 ^(@))`
`= 2 xx 10^(-3) ( 1 + 1) = 4 xx 10^(-3) J`
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