A negative charge of -0.590 C exerts an upward 0.700-N force on an unknown charge that is located 0.400 m directly below the first charge. Part A What is the value of the unknown charge (magnitude and sign)? Express your answer with the appropriate units. HA ? 9 = Value Units Submit Request Answer Part B What is the magnitude of the force that the unknown charge exerts on the -0.590 C charge? Express your answer with the appropriate units. ? F = Value Units Submit Request Answer Part C What is the direction of this force? upward downward Submit Request Answer