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The radius of the circular plates of a p...

The radius of the circular plates of a parallel plate condenser is `'r'`. Air is there as the dielectric. The distance between the plates if its capacitance is equal to that of an isolated sphere of radius `r'` is.

A

`(r^(2))/(4r')`

B

`(r^(2))/(r')`

C

`( r)/(r')`

D

`(r^(2))/(4)`

Text Solution

Verified by Experts

The correct Answer is:
A
`(in_(o)(pi r^(2)))/(d)=4 pi in_(o) r^(1) :. d=(r^(2))/(4 r^(1))`.
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