Compute the capacitance between two concentric shells of inner radius 2m and the outer radius is infinitely large.(a) 0.111 nF(b) 0.222 nF(c) 4.5 nF(d) 5.4 nFThis question was addressed to me during an online interview.My question is from Resistances and Capacitances in section Electrostatic Boundary Value Problem of Electromagnetic Theory

Compute the capacitance between two concentric shells of inner radius

1.	Compute the capacitance between two concentric shells of inner radius 2m and the outer radius is infinitely large.(a) 0.111 nF(b) 0.222 nF(c) 4.5 nF(d) 5.4 nFThis question was addressed to me during an online interview.My question is from Resistances and Capacitances in section Electrostatic Boundary Value Problem of Electromagnetic Theory
Answer» The correct choice is (B) 0.222 nF The explanation is: The concentric shell with infinite outer radius is considered to be an isolated sphere. The CAPACITANCE C = 4πε/(1/a – 1/b). If b->∞, then C = 4πεa. PUT a = 2m, we GET C = 4π X 8.854 x 10^-12 x 2 = 0.222 nF.

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