Electrostatic field কী?

A distribution of charges at rest creates at every point $M$ of space an electric field $\vect E(M)$, defined by the force it exerts on a test charge $q$ placed at $M$: $\vect F = q\vect E(M)$ ($\mathrm{V}/\mathrm{m}$ $=$ $\mathrm{N}/\mathrm{C}$). A point charge $q_1$ at $O$ creates

radial, outward for $q_1 > 0$; a distribution creates the vector sum of the fields of its elements. A field line is a curve tangent at each point to $\vect E$, oriented along it.