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August 29, 2015

Homework Help: Physics

Posted by Tom on Monday, October 10, 2011 at 2:37am.

An infinitely long line charge of uniform linear charge density λ = -3.00 C/m lies parallel to the y axis at x = -2.00 m. A point charge of 4.70 C is located at x = 1.50 m, y = 2.50 m. Find the electric field at x = 2.50 m, y = 2.00 m.


I added the vectors, of the charges. for a uniform line, E= kλ/R. Since the charge on the line is negative, it goes towards the line, and only has an x component of E= -12 kN/C. For the point charge, which is negative, E is away from the source, I got E=30.2 kN/C for the x component, and -15.1 kN/c for the y component. I added the x components, and then found the final magnitude with sqrt(x^2+y^2) as 23.7kN/C. But that is the wrong answer.

What am I doing wrong?

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