A Rod of Infinite Length Has a Charge Per Unit $\lambda$

question 23

Multiple Choice

A rod of infinite length has a charge per unit length of $\lambda$ (= 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 = (4 $\pi$$\isin$ ₀) ^-1,

• A) k\(\lambda\)/r²
• B) k\(\lambda\)/r
• C) 4 \(\pi\)k\(\lambda\)/r
• D) 2k\(\lambda\)/r
• E) zero

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