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A charged ring and a charged circular disk of 10 cm diameter face each other at...

A charged ring and a charged circular disk of 10 cm diameter face each other at a distance of 20 cm. The ring is to the left of the disk; their centers define the x-axis. Each object carries a net charge Q = 20 nC.

a) Without doing any calculations or consulting equations (other than E = Kq/r2 for a point charge): what is the direction of the electric field at the midpoint between the objects? Or is it zero? Explain your answer.

b) Calculate the electric field strength at the mid-point between the rings.

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