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## Homework Statement

We wont to find out the electric field at a point p due to a point charge q placed at o as shown in the figure

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**Consider a sphere of radius r passing through the point p. Let the electric field at p be E then by Gauss law**

my problem is how we get the last step? I dont understand how he integrate it.

## The Attempt at a Solution

i tried it and found a solution but not sure if its correct although i got the same result

sorry that i don't used LATEX but I'm not used with it and i cant write the whole question with LATEX