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- Homework Statement
- Today I was deriving the potential of a point inside a solid non conducting sphere with uniform charge density. Let me show how my sir did this. For that please look at the following pic

As you can see my sir took the integral from r to R.(r is a point's distance from centre). And I chose to take integral limits from R to r. My answer is different For my calculations look below .

Can anyone tell why has this gone wrong.

- Relevant Equations
- E=KQ/r^2 , r>R

E=(KQ/R^3)r

My friend said 'you missed the negative sign the second time you wrote integral of Edr in the right hand side in your second line'. But if put a negative sign it would mean that potential decreases when travelling against ( antiparallel) to field, which is wrong