# [SOLVED]vector plot / stream plot

#### dwsmith

##### Well-known member
$$\vec{E} = -E\cos\theta\left(1 + \frac{2a^3}{r^3}\right)\hat{e_r} + E\sin\theta\left(1 - \frac{a^3}{r^3}\right)\hat{e_{\theta}}.$$

How can I plot this in Mathematica?

#### dwsmith

##### Well-known member
$$\vec{E} = -E\cos\theta\left(1 + \frac{2a^3}{r^3}\right)\hat{e_r} + E\sin\theta\left(1 - \frac{a^3}{r^3}\right)\hat{e_{\theta}}.$$

How can I plot this in Mathematica?
Would this be the E-field for a = 1.35 and E = 1.66?