D V displaystyle dV at point. Formula and Derivation of Electric Field. R x d V displaystyle rho boldsymbol xdV in each small volume of space.
The direction of the field is taken to be the direction of the force it would exert on a positive test charge.
The electric field concept arose in an effort to explain action-at-a-distance forces. The electric field is radially outward from a positive charge and radially in toward a negative point charge. Electric field can also be expressed in volts per metre Vm which is the equivalent of newtons per coulomb The electric force on Q1 is given by in newtons. The Electric Field around Q at position r is.