A charge of 2.20 µC is uniformly distributed on a ring of radius9.0 cm. Find the electric field strength on the axis at thefollowing locations.
(a) 1.2 cm from the center of the ring
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(b) 3.9 cm from the center of the ring
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(c) 4.0 m from the center of the ring
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(d) Find the field strength at 4.0 m using the approximation thatthe ring is a point charge at the origin.
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(e) Compare your results for parts (c) and (d) by finding the ratioof the approximation to the exact result.
(f) Is your approximation result a good one? Explain your answer.(Do this on paper. Your instructor may ask you to turn in yourwork.)
