Two concentric rings, one of radius ‘a’ and the other of radius ‘b’ have the charges +q and -(2 / 5)^−3/2 q

Two concentric rings, one of radius ‘a’ and the other of radius ‘b’ have the charges +q and -(2 / 5)^−3/2 q respectively as shown in the figure. Find the ratio b/a if a charge particle placed on the axis at z=a is in equilibrium.

Two concentric rings, one of radius ‘a’ and the other of radius ‘b’ have the charges +q and -(2 / 5)^−3/2 q

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