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A charge q1= -2 microC is placed at the origin. Another charge q2= +4 microC is placed at x=0.35 m. What is the magnitude and direction of the electric field at x=0.5 m? a) 6.56 x 10^5 N/C, + x b) 6.56 x10^5 N/C, -x c) 1.53 x10^6 N/C, +x d) 1.53 x10^6 N/C, -x

A charge q1= -2 microC is placed at the origin. Another charge q2= +4 microC is placed at x=0.35 m. What is the magnitude and direction of the electric field at x=0.5 m? a) 6.56 x 10^5 N/C, + x b) 6.56 x10^5 N/C, -x c) 1.53 x10^6 N/C, +x d) 1.53 x10^6 N/C, -x

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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With the following problem, I am able to solve it and get to the right answer but I'm looking for clarification on sign usage. I can never figure out when to add or subtract a kq/r^2 part. I also don't know how to tell if it should be in the positive or negative x direction. It would be most helpful if you could clarify how to go about using the correct signs throughout this problem:

 

A charge q1= -2 microC is placed at the origin. Another charge q2= +4 microC is placed at x=0.35 m. What is the magnitude and direction of the electric field at x=0.5 m?

a) 6.56 x 10^5 N/C, + x

b) 6.56 x10^5 N/C, -x

c) 1.53 x10^6 N/C, +x

d) 1.53 x10^6 N/C, -x

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