電磁気の問題です。解き方と答えを教えてください。

質問

A metal sphere of radius R, carrying charge q, is surrounded by a thick concentric metal shell (innner radius a, outer raidius b) the shell carries no net charge.

(a) find surface charge density at R and at b
(b) find potential at the center, using infinity as the reference point.
(c) Now the outer surface is touched to a ground wire, which lowers its potential to zero (same as infinity).

回答No.1

FT56F001 · ベストアンサー

球殻コンデンサの問題ですね。
例えば，
http://www.eee.nagasaki-u.ac.jp/~magnet/fukunaga_home/lectures/Physics/Physics.7.pdf
に，答えが出ています。