일반물리학 2 — Electric Fields: Problem 13

13 In Fig. 22-28, a nonconducting rod of length \(L = 8.15\text{ cm}\) has a charge \(q = -4.23\text{ fC}\) uniformly distributed along its length. (a) What is the linear charge density of the rod? What are the (b) magnitude and (c) direction (relative to the positive direction of the \(x\) axis) of the electric field produced at point \(P\), at distance \(a = 6.00\text{ cm}\) from the rod? What is the electric field magnitude produced at distance \(a = 50\text{ m}\) by (d) the rod and (e) a particle of charge \(q = -4.23\text{ fC}\) that we use to replace the rod? (At that distance, the rod "looks" like a particle.)