Four electrically charged spheres are located on the corners of a square whose sides measures 4.2 cm. All spheres are identically charged except that the three are negative while only one is positive (q3). If the charges are 2.4 μμC. Find the net force acting on q3. Select one: a. The correct answer is not on the choices! b. 0.0056 N @ 45 degrees c. 0.0056 N @ 225 degrees d. 56.1919 N @ 45 degrees e. 56.1919 N @ 225 degrees