Problem 1:
On the attached figure, what is the horizontal component of force exerted on q1 by q3?
Problem 2:
On the attached figure, what is the resultant force exerted on charge q1 by the other three charges?
Problem 3:
On the attached figure, if q1 were replaced by a charge of -4 x 10^-6 C, what would be the resultant force exerted on it by the other three charges?
Possible answers/choices to all the above problems:
(1) 0 N
(2) 0.108 N
(3) 3.77 N
(4) 5.39 N
(5) 7.63 N
(6) 10.8 N
