For #7 and #8, use the figure at the right which represents two point charges Qi

Question

For #7 and #8, use the figure at the right which represents two point charges Qi-+61.4 C and Q.--21.8 pC separated by a distance of 66.0 m. Qu [6] #7. Determine the force on Q2 due to Q1. Answer: a. 8.12 x 10* N, away from Qi. b. 1.07 x 10 d. 3.73 x 10 N, toward Qi. N, toward Q c. 2.76 x 10N, toward Q. e. 4.79 x 10 N, away from Qi. f [8] #8. Determine the location where the net electric field due to Q1 and Q2 is zero? Answer: a. 97.3 m, right ofQs. b. 113 m, left of Q1, c.362 m, right ofQ1. Qi. d. 732 m, right ofQu e. 864 pm,left of

Explanation / Answer

7)

F = k q1q2 / r^2

= 9 x 10^9 x 61.4 x 21.8 x 10^-12 / (66 x 10^-6)^2

= 2.76 x 10^9 N towards Q1

8)

E1 = E2

kq1/R1^2 = kq2/R2^2

61.4 / (x+66)^2 = 21.8 / (x)^2

solving for x

x = 97.3 micro meter on right of Q2

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