Three charges are arranged on a line as shown above. If Q_1 is negative, Q_2 is

Question

Three charges are arranged on a line as shown above. If Q_1 is negative, Q_2 is negative and Q_3 is positive, then Q_2 MUST feel a net force to the right. If Q_1 is positive Q_2 is negative and Q_3 is positive, then Q_2 MUST feel a net force to the right. If Q_1 is positive, Q_2 is negative and Q_3 is positive, then Q_2 MIGHT feel a net force to the right. If Q_1 is positive, Q_2 is negative and Q_3 is negative, then Q_2 MUST feel a net force to the right. In the above figure, R = 1.30 m, Q_1 = 1.73.10^-6 C, Q_2 = Q_1 and Q_3 = -Q_1. Calculate the total force on Q_2. Give your answer with a positive number for a force directed to the right.

Explanation / Answer

Since Q2 and Q3 is negative charges then force of Q3 on Q2 will be towards left

Also Q1 is positive then force of Q1 on Q2 will be towards left

Net force = kQ2*[ (Q1+Q3 ) / R^2 ] = 0.038 N towards left

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