Two parallel plates of area 7.34 x 10-4 m2 have 5.83 x 10-8 C of charge placed on
them. A 6.62 x 10-6 C charge qy is placed
between the plates. What is the magnitude of
the electric force on 91?
Hint: How is force related to the field?
(Unit = N)

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.