Q.Define 'electric field'.

The electric field E at a point is defined as the force per unit positive test charge that would be felt there, E = F/q0 = k q/r^2 r-hat, a vector quantity (SI unit newton per coulomb, NC^-1) that depends only on the source charge q and the field point's position, never on the magnitude of whatever (infinitesimally small) test charge is used to measure it. It points radially away from a positive source charge and radially toward a negative one, and its magnitude falls off as the inverse square of distance from the source, exactly mirroring Coulomb's law itself (indeed E = F/q0 restates Coulomb's law in a form that separates the source's own influence on space from the response of any particular test charge placed in that space). A field is uniform if it has the same magnitude and direction everywhere in some region (as pro …