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a
Explanation: Capacitance between coaxial cylinders of inner radius 1.25cm and outer
radius 1.25 + 2.13 = 3.38cm will be C = 2πεL/ ln(b/a). Put b = 3.38, a = 1.25 and L =
1000m, we get C = 1.957 x 10-7 = 195.7 nF