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Grade 11Electrostatics

A ring of radius R has charge -Q distributed uniformly over it.A charge q is placed at the centre of the ring such that electric field becomes zero at a point on the axis of the ring at a distance R from centre of the ring. The value of q=Q/4rootW . Find W.

Profile image of Ranjita yadav
14 Years agoGrade 11
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1 Answer

Profile image of harsha vardhan
14 Years ago

consider the sphere to have uniform charge distribution lambda

the field due to a small piece of the ring at a point at a distance r on the axial line is given by

dE= K* (lambda)dx/2*r*r

integrating

E=KQ/2*r*r

net field=0

so 

kq/r*r

q=Q/2

w=1/4

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