A rod of infinite length has a charge per unit length of λ = q/l) . Gauss's law makes it easy to determine that the electric field strength at a perpendicular distance r from the rod is, in terms of k = 4π0) -1,
A) kλ/r2.
B) kλ/r.
C) 4πkλ/r.
D) 2kλ/r.
E) zero.
Correct Answer:
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