Dipole

JEE Mains Sample Questions › Electricity and magnetism questions › Dipole

A tiny electric dipole of dipole moment p is placed at a distance r from an infinitely long wire , with it's p normal to the wire. If the linear charge density of the wire is Î» , the electrostatic force acting on the dipole is ?

#Physics #Electricity and magnetism

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Pavithra Ramamoorthy ·2009-03-25 06:41:11

E=Î» /2PIe₀r

e₀- epsilon₀

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Aditya Balasubramanyam ·2009-03-25 08:44:36

What is the force on the dipole?

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Abhishek Priyam ·2009-03-26 01:07:02

assuming p is pointing away from wire..

E on -q = Î»(-q)/2PIÎµ₀r

dE=+Î»qdr/(2Ï€Îµ₀r²)
E on +q = -E+dE ..(charge on +q is oppsite of -q so -E..)

net force on dipole =dE

Î»(qdr)/(2Ï€Îµ₀r²)

qdr=P

=Î»(P)/(2Ï€Îµ₀r²)... attractive ...(as assumed -q is nearer)

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Aditya Balasubramanyam ·2009-03-26 21:54:19

Thanx Priyam....

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Dipole

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