8. An infinite cylinder of radius R has a hole of radius a along its central axis. The rest of the cylinder has a uniform charge density ρ c/m⁻³. Determine the electric field in the region a < r < R.
(A)
(B)
(C)
(D)
(E)
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統計: 尚無統計資料
統計: 尚無統計資料