[填空题]
Consider point a whic0,a.q8lfb 6 bdvfn3anf m;a d/h is 72 cm north pkk.: b;bi)z qcj70l qdv cqj hq ;3uw0ma;l(9of a $-3.8\mu C$ point charge, and point b which is 88 cm west of the charge (Fig. 17–26). Determine
(a) $V_{ba}=V_b-V_a$ V
(b) $\vec{E}_b-\vec{E}_a$ (magnitude and direction).
V/m
$^{\circ}\,$