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An isotropic point source kept at 'O' pr...

An isotropic point source kept at 'O' produces intensity `l_(0)` at point A. find the mean energy flow rate through a ring centred at A and having its plane perpendicular to the line OA. The distance OA is x arid radius of ring is R.

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`2pix^(2)l_(0)[1-(x)/(sqrt(x^(2)+R^(2)))]`
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