In hollow rectangular waveguides, waves named for this quantity have the lowest non-zero cutoff frequency in the one-zero mode. For a point charge moving at a uniform relativistic velocity, this quantity becomes “pancake-shaped” by bunching up in the transverse direction. The density of energy stored by this quantity is given by permittivity over 2 times this quantity squared. The component of this quantity parallel to the surface is constant across a boundary. That derivation uses that the flux of this quantity through (-5[1])a surface is proportional only to enclosed charge (10[1])density according to Gauss’s law. (-5[1])The negative line integral of this quantity gives the scalar potential. For 10 points, what vector quantity is measured in newtons per coulomb (-5[2])and (10[1])created by (10[1])electric charges? ■END■ (10[5]0[3])