[理工] 電磁學

[braceup (QQ捲捲)]

Given the spherically symmetric potential field in free space, V = V*exp(-r/a),
find: (a) the charge density ρv at r=a;
      (b) the electric field at r = a.

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※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 220.141.5.123
推 paladin31:E=-▽V  ，  D=(εo)E  ，  ▽。D=ρv