one of radius a and the other of radius b

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Two concentric rings, one of radius a and the other of radius b, have the charges +q, and −(2/5)^−3/2q, respectively as shown in fig. Find the ratio b/a if a charge particle placed on the axis at z =a is i equilibrium.
30
Oct
Two concentric rings, one of radius a and the other of radius b, have the charges +q, and −(2/5)^−3/2q, respectively as shown in fig. Find the ratio b/a if a charge particle placed on the axis at z =a is i equilibrium. and −(2/5)^−3/2q have the charges +q one of radius a and the other [...]
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Tags: and −(2/5)^−3/2q , have the charges +q , one of radius a and the other of radius b , respectively as shown in fig. Find the ratio b/a if a charge particle placed on the axis at z =a is i equilibrium. , Two concentric rings ,