Three electric charges are arranged on a straight line as shown in the figure. S
ID: 1899227 • Letter: T
Question
Three electric charges are arranged on a straight line as shown in the figure. Select True or False for the following statements. If Q1 is positive, Q2 is negative and Q3 is positive, then Q2 MIGHT feel a net force to the right. If Q1 is negative, Q2 is negative and Q3 is positive, then Q2 MUST feel a net force to the right. If Q1 is positive, Q2 is negative and Q3 is positive, then Q2 MUST feel a net force to the right. If Q1 is positive, Q2 is negative and Q3 is negative, then Q2 MUST feel a net force to the right.
In the above figure, R = 1.58 m, Q1 = 1.22?10-6 C, Q2=-Q1 and Q3=-Q1. Calculate the total force on Q2. Give your answer with a positive number for a force directed to the right.
Explanation / Answer
Like forces repel while opposites attract. -For the first true/false there’s a -,-,+ so there Must be a force to the right. -for the second true/false there’s a +,-,+ so it only moves to the right if the positive charge is greater on the right so it MIGHT move to the right is TRUE PART 2 2) In the above figure, R = 1.84 m, Q1 = 1.85×10-6 C, Q2=-Q1 and Q3=-Q1. Calculate the total force on Q2. Give your answer with a positive number for a force directed to the right. -1.82×10-2 N Explanation: You must use Coulomb’s law : k * (q1*q2)/(r^2) k= 9 x 10 ^9 The total force is : the force of Q1 acting on Q2 +the force of Q3 acting on Q2. 9E9 * abs(1.85E-6 * -1.85E-6)/(1.84^2) = 9.10E-3 since the force between Q3 and Q2 are the same numbers it also = 9.10E-3 So add the two forces up: 9.10E-3 + 9.10E-3 = -1.82E-2N