22.62: Using the technique of 22.61, we first find the field of a cylinder off-axis, then the electric field in a hole in a cylinder is the difference between two electric fields—that of a solid cylinder on-axis, and one off-axis. . 2 ) ( 2 200 200 encl ε ρ ε r ρ E r lπ ε
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Electric charge, The Technique, Georgia Institute of Technology, solid cylinder