[題目] 普物一題
[領域] 普物
[來源] BENSON
[題目]
A thin semi-circular ring of radius R has a a nonuniform linear density
λ(θ)=λ sinθ.What is the field strength at the center?
[瓶頸]
dq = Rλ(θ)dθ
π kRλcosθsinθ
∫dE = ∫ ------------------ dθ
0 R^2
π sin2θ
= kλ∫-----------dθ
0 4 R
kλ(1-cos2θ)
解答是對 --------------------- 積分
2R
為什麼 它的線密度不用微分??
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