3. A 4.0 x 10"" C charge is initially located 3.0 m from a stationary 6.0 x 10- C charge. How much work is required to move the 4.0 x 10" C charge to a point 0.50 m from the stationary charge? 3.0 m 4.0 x 10"'C O 6.0x10 C 0.50 m 4. Two point charges, 2.5 x10- C and -5.0 x 10- C, are placed 3.0 m apart as shown below. 2.5 x10 C -5.0 x 10 C -1.5 m -1.5 m What is the magnitude of the electric field at point P, midway between the two charges