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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.
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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