6. [3 marks) Two identical positive point charges X and Y are placed 0.30 m apart on a horizontal line. O is the point midway between X and Y. The charge on X and the charge on Y is +4.0 JC. a. [3 marks] Calculate the electric potential at 0. b. [2 marks] Sketch, on the axes, the variation of the electric potential Vwith distance between X and Y. AUS X O Y distance wire moves rough a region the p Sholdugb al notiston to vorpups loja wenwe an alboring bag ima dissent acusny c. [2 marks] A positive charge Z is released from rest 0.010 m from 0 on the line between X and Y. Z then begins to oscillate about point 0. Z O Y Identify the direction of the resultant force acting on Z as it oscillates. d. [2 marks] Deduce whether the motion of Z is simple harmonic. 7. Two capacitors Ci and C2 of capacitance 28 uF and 22 uF respectively are connected in a circuit with a two-way switch and a cell of emf 1.5 V with a negligible internal resistance. The capacitors are initially uncharged. The switch is then connected to position A