- #1
squelch
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Homework Statement
Positive charge Q is distributed uniformly around a semicircle of radius a. Detirmine ##\vec{E}## around at the center of curvature P.
Homework Equations
$$\vec{E}=K\frac{Q}{r^2}\hat{r}$$
The Attempt at a Solution
Taking a small slide of length dl from the semicircle, the field ##d\vec{E}## due to the charge ##dQ## is ##d\vec{E}=K\frac{dQ}{a^2}\hat{r}##.
Where I'm getting confused is the definition of dQ
$$dQ=\rho*a*d\theta$$
What is ##\rho## meant to represent?