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 $$\ell$$.

Details

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