Recent content by Ammora

Homework Statement Consider the following figure. image: http://www.webassign.net/grr/p17-18.gif" (a) Find the electric potential at points a and b for charges of +3.5 nC and -7.6 nC located as shown in the figure. Va= _____ V Vb= _____ V (b) What is the potential difference ΔV...

No, it's from Webassign, not a book.

Find the electric potential energy for the following array of charges: charge q1 = +4.0 µC is located at (x, y) = (0.0, 0.0) m; charge q2 = +3.0 µC is located at (4.0, 3.0) m; and charge q3 = −1.0 µC is located at (0.0, 3.0) m. We have to find the electric potential for all 3 charges.

I tried that, but it says it's wrong. Using it, r12 would be: sqrt. (4^2 + 3^2) = 5 r13: sqrt. (0^2 + 3^2) = 3 r23: sqrt. (3^2 + 0^2) = 0 and plugging it into the equation kq1q2/r12, kq1q3/r13, kq2q3/r23 and adding them all up gives me 5.9 x 10^-4 Joules, which is 0.59 millijoules...

Oh ok, I see. You're right, I'm sorry for getting so confused. Oh well, even if I can't get points for it now, at least I'll know what to do when the test comes around. Thank you very much for being patient with me.

Yes, the third part of the question was in what direction, and I already answered in "towards corner C" and they said it was correct. I understand everything you said, it makes sense to me, but that's not enough to pass the class, I have to get the number right also. I have no way of checking...

see "relevant equations". I already know I have to add them all up. I just don't know how to calculate r.

Homework Statement Find the electric potential energy for the following array of charges: charge q1 = +4.0 µC is located at (x, y) = (0.0, 0.0) m; charge q2 = +3.0 µC is located at (4.0, 3.0) m; and charge q3 = −1.0 µC is located at (0.0, 3.0) m. _____ mJ Homework Equations...

I did add them. 18 + -6 = 12. I still don't understand what I did wrong.

Well, it says it's wrong. And that was my last submission :frown: Thanks anyway for the quick reply.

Oh, so it should be 0.045 m sqrt. 2? Thank you so much, I wasn't paying attention to my units. This forum is awesome, I get such quick helpful replies, and I learn, not just copy.

Homework Statement As shown in the figure, a square has sides of d = 9.0 cm with a charge of Q = +18.0 µC at one corner (a) and with charges of q = -6.0 µC at the remaining three corners (b, c, and d). Image: http://www.webassign.net/grrphys2/17-p-018-alt.gif" Find the electric field at the...

Homework Statement An equilateral triangle has a point charge +q at each of the three vertices (A, B, C). Another point charge Q is placed at D, the midpoint of the side BC. What is the charge Q if the total electric force on the charge at A due to the charges at B, C, and D is zero? (Use...

Homework Statement Two tiny objects with equal charges of 7.48 µC are placed at the two lower corners of a square with sides of 0.350 m, as shown. Image: http://www.webassign.net/grrphys2/16-p-039.gif Find the electric field at point A, the upper left corner. (Assume the positive...

Since they're both +, the force is repulsive. So I have: q2: Fx= - k(0.71e-6)(1e-6)/(0.71e-6 cos30)^2 Fy= - k(0.71e-6)(1e-6)/(0.71e-6 sin30)^2 (both components are negative, because the force points in the negative x direction, since they're repulsive to the positive charge of q3.) q3...