1. (5%) A cylindrical capacitor consists of an inner conductor of radius a, and an outer conductor whose inner radius is b. The space between the conductors is filled with a dielectric of permittivity ε. The length of the capacitor is L. The capacitance of this this capacitor is
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(A) C=2πεL/ln(b/a)
(B) C=2πεL/In(a/b)
(C)C=2πεL/In(ab)
(D) none of the mentioned

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統計： A(1), B(0), C(0), D(0), E(0) #2853376