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a unifrom surface charge density 8sigma ...

a unifrom surface charge density `8sigma` exists over the entire `x-y` plane except for a circular hole of radius of a point `p(0,0,sqrt(3))` on the z-axis is found to be `2sqrt(x)(sigma)/(epsilon_(0))` ,Find the value of `x`.

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The correct Answer is:
3
`E_(net)=(sigma)/(2epsilon_(0))-E_(dis)`
`rArr E_(net)=(sigma')/(2epsilon_(0))-(sigma)/(2epsilon_(0))(1-(z)/(sqrt(z^(2)+a^(2))))`
`E_("net")=(sigma')/(2epsilon_(0)sqrt(z^(2)+a^(2)))`
` rArr E_("net")=((8sigma)sqrt(3)a)/(2epsilon_(0)(2a))=sqrt(12)(sigma)/(epsilon_(0))=2sqrt(3)(sigma)/(epsilon_(0))`
`rArr x=3`
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