Can someone help with this question and explain the answer,Thanks so much!!! The

Question

Can someone help with this question and explain the answer,Thanks so much!!!
The capacitance of a cylindrical capacitor can be increasedby:
A) decreasing both the radius of the inner cylinder and thelength B) increasing both the radius inner cylinder and thelength C) increasing the radius outer cylindrical shell anddecreasing the length D) decreasing the radius inner cylinder and increasing theradius of the outer cylindrical shell E) only by decreasing the length Can someone help with this question and explain the answer,Thanks so much!!!
The capacitance of a cylindrical capacitor can be increasedby:
A) decreasing both the radius of the inner cylinder and thelength B) increasing both the radius inner cylinder and thelength C) increasing the radius outer cylindrical shell anddecreasing the length D) decreasing the radius inner cylinder and increasing theradius of the outer cylindrical shell E) only by decreasing the length

Explanation / Answer

the capacitance of a cylindrical capacitor is C = 2 l/ ln (b/a) to increase the capacitance the denomenator should bedecreased            so b/a value should be decreased so by increasing the value of a and by decreasing the value ofb and by increasing length

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