T \"\"\"\"\"\" T l : sl is l l ' I ' I J; ---------- 4 -Q 5 +Q Four charged particles are held xed at the corners of a square of side 5 = 2 cm. All the charges have the same magnitude Q = 3 uC, but two are positive and two are negative. As shown above, charges of the same sign are at opposite corners. (a) What would the net force be on a test particle placed at the center of the arrangement? Justify your answer. (b) What is the net force F acting on the -Q charge in the lower lefthand corner? +Q s Q T \"\"\"\"\" 1' g a L .......... .1 +Q S -Q Arrangement 2 The bottom two charged particles are now switched to form Arrangement 2, shown above, in which the positively charged particles are on the left and the negatively charged particles are on the right. (c) Would the net force be the same at the center of Arrangement 2 as what you determined in part (a)? Explain your answer. (d) What is the net force F acting on the +Q charge in the lower left-hand corner of Arrangement 2