[问答题]
Two equal but opposite charges are separau:fug -zub/ rf jj1dsyg.4l8,.- srkoted by a d3wv )/ kjuxaujx*m / bwej/7luq-/w5 cistance d, as shown in Fig. 17–27. Determl3a /7u)jx-uw5kjv*j xw /beuwc/ q/mine a formula for $V_{BA}\,=\,V_B-V_A$ for points B and A on the line between the charges.
