(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

See figure attached.

2. Relevant equations

3. The attempt at a solution

See figure attached.

The solution shows that,

[itex]\vec{r} = x \hat{i} + y \hat{j} + z \hat{k}[/itex]

How did they obtain this?

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# Electric field vector & surface integral

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