Two point charges are separated by 5 cm, with
an attractive force between them of 18 N.
Find the force between them when they are
separated by 16 cm. The Coulomb constant
is 8.99 × 109 N · m2
/C
2
.
Answer in units of N. If the two charges have equal magnitude, what
is the magnitude of each charge for the original force of 18 N?
Answer in units of C.
