Question

7 Electric forces and pairs of charges Two charged particles, A and B, are held fixed. Let FA on B be the magnitude of the force exerted by A on B and FB on A be the magnitude of the force exerted by B on A. Which of the following is true? Explain your answer +3.0C +12.0C i) FB on A FA on B i) FB on A FA on B ii) FB on A 3FA onB iv) FB on A 4FA onB v) FB on A 12FA on B

Answer 1

Force due to the charged particle F= K*Q1*Q2/r^2

F_{B on A} = K*12*3*/r^2 = K*36/r^

F_{A on B} = K*3*12/r^2 = K*36/r^2

So

F_{B on A} =F_{A on B}

_{Option ii is true}