1) Two charges are a distance of 0.3 m apart. Charge #2 is to the right of charg
ID: 1322174 • Letter: 1
Question
1) Two charges are a distance of 0.3 m apart. Charge #2 is to the right of charge #1. Charge #2
(which is twice as large as charge #1) experiences a force the size of 13 pN due to charge #1.
Assume that there are no other interactions present.
If the charges are instead separated by a distance of 0.6 m apart, then calculate the size of the
force that charge #2 experiences. (include 3 significant figures in your answer)
2) Two charges are a distance of 0.2 m apart. Charge #2 is to the right of charge #1. Charge #2 (which is twice as large as charge #1) experiences a force the size of 30 pN due to charge #1. Assume that there are no other interactions present.
If the charges are instead separated by a distance of 0.6 m apart and the size of charge #1 is doubled, then calculate the size of the force that charge #2 experiences. (include 3 significant figures in your answer)
3) Two charges are a distance of r apart. Charge #2 is to the right of charge #1. Charge #2 (which is twice as large as charge #1) experiences a force the size of 18 pN due to charge #1. Assume that there are no other interactions present.
Calculate the size of the force that charge #1 experiences. (include 3 significant figures in your answer)
Explanation / Answer
1) F1 = 13 pN = 13*10-12 N r1 = 0.3 m F2 = ............ r2 = 0.6 m
F1/ F2 = r2^2/r1^2
13*10^-12 /F2 = 0.6^2/0.3^2= 0.36 /0.09
13*10^-12/F2 = 4
F2 = 13*10^-12/4 = 3. 25 *10^-12 N = 3.25 pN
similar ly 2)
F2 = 1/9 F1 = 30 pN/9 = 3.33 pN
similarly 3
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