All these questions please if possible thank you you will be helping a ton :)

4. Calculate the magnitude of the net electrostatic force acting on the 28 JC due to the other two charges shown. Assume that, relative to the 35 uC charge, the other two charges are positioned at right angles to each other. 56 HC 35 JC - - 0.42 m 0.17 m 28 HC 9. How much work is required to separate two charges of +25 uC and -25 uC further apart from an initial distance of 0.40 m to a new distance of 0.85 m? 10. Determine the potential difference between the initial location of point A and the new position B, relative to the central charge shown below. 71 = 2.50 m A 2=-6.80 HC 12 = 4.20 m - - - -DO 1 1. Two parallel charged plates have a separation of 1.50 x 102m, and a potential difference between them of 675 V. A small plastic sphere of mass 4.41 x 10-15 kg is held suspended in the electric field generated by the voltage of the plates. 1.50 x 10-2 m 0m =4.41 x 10-15 kg AV = 675 V a) Determine the electric field strength between these two plates. a) 2 marks b) What is the magnitude and polarity of the charge on the plastic sphere