For #3 and #4, use the figure at the right which represents two point charges Q-
ID: 1580078 • Letter: F
Question
For #3 and #4, use the figure at the right which represents two point charges Q-(36x 10 e and Q- (78 x 10)e, which are separated by a distance of 22.6 nm. Note: e is the fundamental electric charge. Answer aue mopx he forcte odne richt o 0. 1.92 x 10- N,to he right. .127 x 10'N,to the right. d194x10 right. e. 5.68 x 10 N, to the left. f [8] #4. Determine the location where the net electric field due to Q1 and Q2 is zero? Answer: a. 3.5 nm, of e. 11.6 nm, right of Qi. f left oro. b. S.12 nin, left of Q2. c. 7.22 nm,le ft ofQ2· o e 4914 nm, right ofQuExplanation / Answer
6. F = k |Q1||Q2| / d^2
F = (9 x 10^9)(36 x 10^8 x 1.6 x 10^-19)(78 x 10^8 x 1.6 x10^-19) / (22.6 x 10^-9)^2
F = 1.27 x 10^7 N
both are of same sign charge hence Q1 will repel Q2 away.
direction -> to the right
Ans: (c)
8. zero field point will be inbetween the charges.
E = k(Q1)/d^2 - k (Q2)/ (22.6 - d)^2 = 0
(36)/d^2 = 78 / (22.6 - d)^2
(22.6 - d ) / d = sqrt(78/36) = 1.472
d = 9.14 nm
Ans(d) 9.14 nm right of q1.