A ring of mass m and radius r has charge -Q uniformly distributed around it.  The ring is located a distance h from an infinite grounded conducting plane. Let z be the  vertical coordinate with z = 0 taken to be the center of the infinite conducting plane. Find  the electric field above the conducting plane at points on the axis of the ring. Your answer should be a function of Q, r, and h.

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Subject: Ideal Conductors and Capacitors

A ring of mass m and radius r has charge -Q uniformly distributed around it. 
The ring is located a distance h from an infinite grounded conducting plane. Let z be the 
vertical coordinate with z = 0 taken to be the center of the infinite conducting plane. Find 
the electric field above the conducting plane at points on the axis of the ring. Your answer
should be a function of Qr, and h.

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