A circular ring of charge of radius a lies in the xy plane and is centered at

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A circular ring of charge of radius a lies in the x–y plane and is centered at the origin. If the ring is in air and carries a uniform density l
, (a) Show that the electrical potential at (0, 0, z) is given by V = la / [2 a2 + z2)1/2, and
(b) Find the corresponding electric field E
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