A -3.00 nC point charge is at the origin, and a second -6.50 nC point charge is
ID: 1883035 • Letter: A
Question
A -3.00 nC point charge is at the origin, and a second -6.50 nC point charge is on the z-axis at 0.800 m. Part A Find the electric field (magnitude and direction) at point on the z-axis at x = 0.200 m. Express your answer with the appropriate units. Enter positive value if the field is in the positive -direction and negative value if the field is in the negative r-direction. EValue Units SubmitRequest Answer Part B Find the electric field (magnitude and direction) at point on the z-axis at x = 1.20 m. Express your answer with the appropriate units. Enter positive value if the field is in the positive r-direction and negative value if the field is in the negative r-direction. Ez= Value UnitsExplanation / Answer
A)
q1 = -3nC ; q2 = -6.5nC ; r1 = 0.2m ; r2 = 0.6m
-ve charge will help only determine direction of field. E1 as left and E2 as right
E = E2 - E1 = k (q1/r1^2 - q2/r2^2)
= 9 x 10^9 ( 3 x 10^-9 / 0.2^2 - 6.5 x 10^-9 / 0.6^2)
= 512.5 N/C right (as positive)
The rest can be solved in the similar fashion
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