Question

Question 8 In the figure particles 2 and 4, of charge -e, are fixed in place on a y axis, at y2--8.32 cm and y-4.16 cm. Particles 1 and 3, of charge -e, can be moved along the axis. Particle 5, of charge +e, is fixed at the origin. Initially particle 1 is atx」=-8.32 cm and particle 3 is at X3 = 8.32 cm. (a) To what x value must particle 1 be moved to rotate the direction of the net electric force net on particle 5 by 30 °counterclockwise? (b) With particle 1 fixed at its new position, to what x value must you move particle 3 to rotate back to its original direction? (a) Number Units (b) Number Units

Answer 1

Ans. Before moving particle 1, The net force on the particle 5 is along + y-axis as forces due to particle 1 and particle 2 cancel each other out. Moving particle 1 along x-axis will not change the y component of the force on particle 5. We move the particle 1 towards the origin as this will produce a component of net force in -x-direction thus rotating it by 30 in CCW.

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