Made of straws

Electricity and Magnetism Level 5

Suppose you have two long, parallel, conducting straws of radii \(r_1,r_2\) separated by a distance \(d > r_1+r_2\).

Find the capacitance (in pF) of a section near the middle of the straws of length \(\ell\).


  • \(\ell = 25\) cm
  • \(r_1 = 3\) cm, \(r_2 = 7\) cm
  • \(d = 15\) cm

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