- #1

emhelp100

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## Homework Statement

A point charge +Q exists at the origin. Find [itex]\oint[/itex] [itex]\vec{E} [/itex] [itex]\cdot \vec{dl}[/itex] around a circle of radius a centered around the origin.

## Homework Equations

## The Attempt at a Solution

The solution provided is:

[itex]\vec{E} = \hat{\rho}\frac{Q}{4\pi E_0a^2}[/itex]

[itex]\vec{dl}=\hat{\phi}\rho d\phi[/itex]

Why are cylindrical coordinates being used here?