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Point charge q s placed at a point on th...

Point charge q s placed at a point on the axis of a square non-conducting surface. The axis is perpendicular to the square surface and is passing through its centre. Flux of electric field throught he square caused due to charged q is `phi`. If the square is given a surface change of uniform density `sigma`, find the force on the square surface due to point charge q.

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The correct Answer is:
`sigma phi`
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