[理工] 線電荷球殼一問
A very long, conducting tube (hollow cylinder)
has inner radius a and outer radius b.It carries charge per unit length v.
A line of charge lies along the axis of the tube,
and has charge per unit length μ.
Calculate the electric field (magnitude and direction)in terms of
v, μ, and r, where r is the distance from the axis of the tube, for
a) (i) r < a, (ii) a < r < b, and (iii) r > b.
b) What is the charge per unit length on the inner surface of the tube and on
the outer surface?
在(a)(iii) 我是覺得內部應該被荓蔽所以只看 v 但答案好像是u+v都要考慮
請問是為什麼?不是應該被荓蔽了嗎?
(b)我是覺得inner surface內外皆會受影響,所以應該是v-u
outer surface只會受外側影響,應該是v
但其反而是inner surface -u
outer surface v+u
有哪位大大可以跟我解釋一下嗎
解答不一定對
謝謝^^
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