\Delta V = V_b - V_a = \frac{{\Delta U}}{{q_0 }} = - \int_a^b {E \cdot d\ell }

% MathType!MTEF!2!1!+-
% feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqr1ngB
% PrgifHhDYfgasaacH8YjY-vipgYlh9vqqj-hEeeu0xXdbba9frFj0-
% OqFfea0dXdd9vqai-hGuQ8kuc9pgc9q8qqaq-dir-f0-yqaiVgFr0x
% fr-xfr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeuiLdq
% KaamOvaiabg2da9iaadAfadaWgaaWcbaGaamOyaaqabaGccqGHsisl
% caWGwbWaaSbaaSqaaiaadggaaeqaaOGaeyypa0ZaaSaaaeaacqqHuo
% arcaWGvbaabaGaamyCamaaBaaaleaacaaIWaaabeaaaaGccqGH9aqp
% cqGHsisldaWdXaqaaiaadweacqGHflY1caWGKbGaeS4eHWgaleaaca
% WGHbaabaGaamOyaaqdcqGHRiI8aaaa!500B!

Pasting the above "text" into MathType 5.0 will enter the above equation and make it possible to edit, save, and use in applications such as MS Word.