Three electric charges are arranged on a straight line as shown in the figure 2

Question

Three electric charges are arranged on a straight line as shown in the figure 2 True: If Q1 is positive, Q2 is negative and Q3 is positive, then Q2 MIGHT feel a net force to the right. Selet rue ior Positi ver che tolewirve antd QS 's positive, then 02 MIGHT feel a net force to the right. False: If Q1 is positive, Q2 is negative and Q3 is positive, then Q2 MUST feel a net force to the right. True: If Qi is negative, Q2 is negative and Q3 is positive, then Q2 MUST feel a net force to the right. False: If Q1 is positive, Q2 is negative and Q3 is negative, then Q2 MUST feel a net force to the right. Computer's answer now shown above. You are correct Your receipt no. is 154-5852 Previous Tries In the above figure, R 1.64 m, Q1- 1.64x10-6 C, Q2-Q1 and Q3--Q1. Calculate the total force on Q2 nter your response as positive if the force is to the right and negative if the force is to the left. Use Coulomb's Law and superposition of electric forces Submit Answer Incorrect. Tries 3/12 Previous Tries

Explanation / Answer

q1 = 1.64e-6 C

q2 = -1.64e-6 C

q3 = -1.64e-6 C

F21 = kq1q2 / R2

F21 = 9e9*1.64e-6*1.64e-6 / 1.642

F21 = -9e-3 N ( negative sign means to the left)

F23 = kq2q3 / R2

F23 = 9e9*1.64e-6*1.64e-6 / 1.642

F23 = + 9e-3 N (Positive sign means repulsion between q2 and q3 which means force on q2 is to the left)

As both forces are to the left,

Force on q2 = 2*9e-3 N

Force on q2 = 0.018 ( to the left)

Force on q2 = - 0.018 N

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