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A cylinderical capacitor has two co-axia...

A cylinderical capacitor has two co-axial cylinders of length 20 cm and radii 2r and r . Inner cylinder is given a charge of ` 10 mu C` and Outer cylinder is given a charge of `-10 mu C`. The potential difference between the two cylinder will be

A

`( 0.1 ln 2 )/( 4 pi epsilon_(0)) mV`

B

`( ln2)/( 4pi epsilon_(0)) mV`

C

` (10 ln 2)/( 4 pi epsilon_(0))mV`

D

`( 0.01 ln 2)/( 4 pi epsilon_(0))mV`

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