1.

A tiny electric dipole of dipole moment p is palced at a distance r from an infinitely long wire, with its vecp normal to the wire. If the linear charge density of the wire is lambda, the electrostatic force acting on the dipole is equal to

Answer»

`(lambdaP)/(4piepsilon_(0)R)`
`(lambdaP)/(piepsilon_(0)r)`
`(2lambdaP)/(piepsilon_(0)r)`
`(lambdaP)/(2piepsilon_(0)r^(2))`

Solution :`(lambdap)/(2piepsilon_(0)r^(2))`
`F_("net")=2Fsin(theta//2)`
`=Ftheta=qE(l//r)`
`=(lambdap)/(2piepsilon_(0)r^(2))`


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