[填空题]
The work done by an extz,2 ueaoprj jphl ()8 nrm+j3(:;agrb lz ihtb nv8ud,7ctc*6oa69+ vernal force to move a $-8.50\mu C$ charge from point a to point b is $15.0 \times10^{ -4}\;J$. If the charge was started from rest and had $ 4.82\times10^{ -4}\;J$ of kinetic energy when it reached point b, what must be the potential difference between a and b? V
