two point charges 4q and -q, two point charges q1 and q2, two point charges q and -3q, two point charges +q and +9q, the point charges q and -2q, the point charges -2q -2q and +q, two point charges q each
two point charge -q and q/2. There are any references about two point charge -q and q/2 in here. you can look below.
two point charges 4q and -q
two point charges q1 and q2
two point charges q and -3q
two point charges +q and +9q
the point charges q and -2q
the point charges -2q -2q and +q
two point charges q each
two point charges 4q and -q, two point charges q1 and q2, two point charges q and -3q, two point charges +q and +9q, the point charges q and -2q, the point charges -2q -2q and +q, two point charges q each
