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Suppose ,one wishes to construct a1.0far...

Suppose ,one wishes to construct a`1.0`farad capacitor using circular discs. If the separaton between the discs be kept at `1.0`mm, what would be the rradius of the discs?

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Let the radius of the disc `= r`
So, `C = eplision_0 A / d = eplision_0 pie r ^(2) / d`
or, `r^(2) = cd / eplision_0 pie`
`= 1 xx 10 ^(-3) / 8.8 xx 10^(-12) xx 3.14 `
`= 0.36 xx 10^(8)`
`r = 6.0 xx 10 ^(2) = 6 km.
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