A point charge Q = -12 C, and two other charges, q1 and q2, are placed as shown.

Question

A point charge Q = -12 C, and two other charges, q1 and q2, are placed as shown. The electric force components on charge Q are Fx = +0.005 N and Fy = -0.003 N.

In Fig. 21.3, the number of excess electrons in charge Q is closest to:

5.5 x 1013

9.5 x 1013

8.5 x 1013

7.5 x 1013

6.5 x 1013

A point charge Q = -12 I1/4 C, and two other charges, q1 and q2, are placed as shown. The electric force components on charge Q are Fx = +0.005 N and Fy = -0.003 N. In Fig. 21.3, the number of excess electrons in charge Q is closest to: 5.5 times 1013 9.5 times 1013 8.5 times 1013 7.5 times 1013

Explanation / Answer

Simply divide the total charge by the charge per electron

12 X 10^-6/1.6 X 10^-19 = 7.5 X 10^13 excess electrons (The last choice in the given list)

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