Hey and thank you for the answer.
Apparently i can't edit post so i can't update the first one.
Yes, $$\vec{a_R}$$ is a unit vector in R-direction, and R is the length of the same vector. The equation you named is simple a formula for calculating the electric field from a charge distribution...
Hello. I have a problem calculating the electric field from spherical charge distribution. The exercise is:
1. Homework Statement
Homework Equations
To solve the problem for $$ 0\le R < a$$ i tried 2 ways:
$$
\vec{E} = \frac{\vec{a_R}}{4\pi\epsilon_0}\int_v\frac{1}
{R^2}\rho dv
$$
and the...