Posted by **Paul** on Sunday, October 9, 2011 at 5:30pm.

An infinitely long line charge of uniform linear charge density λ = -3.00 µC/m lies parallel to the y axis at x = -2.00 m. A point charge of 4.70 µC 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 get 23.7 kN/C, why is that wrong?

- Physics -
**bobpursley**, Sunday, October 9, 2011 at 5:34pm
I haven't done the calcs, but how can you just have a magnitude? This is a vector addition of two components of E.

- Physics -
**Paul**, Sunday, October 9, 2011 at 5:38pm
yes, 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.

## Answer this Question

## Related Questions

- Physics - An infinitely long line charge of uniform linear charge density &#...
- physics E&M - I posted a question on here earlier but I wasn't able to solve ...
- physics-E&M - An infinite line charge of uniform linear charge density lambda...
- Physics - An infinitely long line of charge has linear charge density ë. Find ...
- Physics - A long, straight wire has a uniform linear charge density of 7.50X10...
- Physics - A long, straight wire has a uniform linear charge density of 7.50X10...
- Physics - Three point charges lie in a straight line along the y-axis. A charge ...
- physics - Three point charges lie in a straight line along the y-axis. A charge ...
- physics - Three point charges lie in a straight line along the y-axis. A charge ...
- physics - A long, thin straight wire with linear charge density -λ runs ...

More Related Questions