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1. The attached figure shows a test charge q between the two positive charges. F

ID: 2127297 • Letter: 1

Question


1.The attached figure shows a test charge q between the two positive charges. Find the force (in newtons) on the test charge for q = -5

The attached figure shows a test charge q between the two positive charges. Find the force (in newtons) on the test charge for q = -5 mu C. Give a positive answer if the force is to the right and a negative answer if the force is to the left. For the previous question, find the electric field (in newtons/coulomb) at the position of test charge. Again, supply a positive value if the electric field points to the right and a negative value if it points to the left.

Explanation / Answer

1)

F = 9*10^9*5*10^-6*3*10^-6/0.02^2-9*10^9*5*10^-6*2*10^-6/0.03^2 = 237.5 N

2)

E = 9*10^9*3*10^-6/0.02^2-9*10^9*2*10^-6/0.03^2 = 47500000 N/C