PHYSICS HELP PLEASE?

Posted on 2015-11-18 06:54:00 in Physics by DIVA

You've put 5 nC of charge on a 7 cm long, thin rod. The charge is approximately evenly spread out. You want to figure out how strong the electric field is 2 meters away from one of the ends of the rod along the axis defined by the rod's length. You decide to get an approximate answer by imagining that you can replace the rod with a point charge located at the position of the rod's center.

(a) How strong does this approximation estimate the field to be? Answer is 10.85 N/C
(b) By how much does your approximation differ from the exact answer?
(c) Suppose that you hold a particle of charge 6 nC a distance 10 cm above the midpoint of the charged rod. How much electric force is exerted on the rod due to the point charge's electric field?

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