Q4. Calculate the net electric field strength at the midpoint of the two charges below, including direction. [ST] +27 x 10-6C -44 x 10 6C 92 r = 10.0 cm b) A test charge, q. = +29 x 10"" C, is placed at the midpoint between q, & q2 Calculate the net electric force on the test charge. [2A] c) How would the answer in part b change if the test charge was qt = -29 x 10" C? Explain why. [2 KU]