A+3.00); c charge with a mass of 4.00 x 10-3 kg hovers above a horizontal flat insulating surface, neither descending nor ascending, and thus in mechanical equilibrium. taking g = 9.8 m/s2, what is the magnitude of the electric force on the charge? hint: keep in mind that the weight force is given by f mg ? a. 0.0281 n o b. 0.0392 n c. 0.0473 n 0 d. 0.0671 n