試題詳解

1. The capacitance of a cylindrical capacitor can be increased by:
(A) decreasing both the radius of the inner cylinder and the length.
(B) increasing both the radius inner cylinder and the length.
(C) increasing the radius outer cylindrical shell and decreasing the length.
(D) decreasing the radius inner cylinder and increasing the radius of the outer cylindrical shell.
(E) only by decreasing the length.