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(a) Derive an expression for the torque ...

(a) Derive an expression for the torque experienced by an electric dipole kept in a uniform electric field.
(b) Calculate the work done to dissociate the system of three charges placed on the vertices of a triangle as shown.
Here `q= 1.6 xx 10^(-10)C`.

Text Solution

Verified by Experts

(b) `U=(1)/(4pi epsilon_(0)) ((-4q)q)/(r )+(1)/(4pi epsilon_(0))+((q)(2q))/(r )+(1)/(4pi epsilon_(0)) ((-4q)(2q))/(r )`
`=(1)/(4pi epsilon_(0)r) (-4q^(2)+2q^(2)-8q^(2))`
`=(-9xx10^(9)xx10xx(1.6xx10^(-10))^(2))/(10^(-1))=-2.34xx10^(-10)J`
Therefore, work done `=(2.34xx10^(-10))J`.
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