One negative and two positive point charges are arranged on three corners of squ

Question

One negative and two positive point charges are arranged on three corners of square, as shown This figure is used in problem 49 and 50 Which arrow best represents the DIRCTION of the electric FIELD on the unoccupied corner? What new point charge could you place on the unoccupied corner in order to make the POTENTIAL at the center of the square equal to zero? -3Q -2Q -Q +Q +2Q Three point charges, -24muC + 9.0muC and an unknown charge, Q are placed in a line, as shown What value of Q will make the net electric FORCE on the MIDDLE + 9.0muC charge equal to ZERO? -12muC +50muC -24muC -54muC +16muC A+40muC and + 15muC point charge occupy the two lower corners of the triangle shown below. How much external WORK is required to move the 15muC charge to the unoccupied corner of the triangle? (assume no change in kinetic energy during this process) -140J -27J 0J +20J +500J

Explanation / Answer

49. option E [ as both the p[ositive charges cancel out each others electric fields]]
50. Option Optino A ( so that the net charge becomes zero, which will make potential zero as akll the distances are equal)
51. so, -24/4^2 = q/6^2
q = -54 micro C
52. PE at the third corner = k(40/0.05 + 15/0.03)*10^-6*15*10^-6 = 175.1 J

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