Recent content by Sean1218

With a charge of 8E-6 C x: kq/r2 = (9E9)(8E-6)/(42) = 4500 y: kq/r2 = (9E9)(8E-6)/(32) = 8000 E=sqrt(45002 + 80002) E=9179 or: r=5 kq/r2 = (9E9)(8E-6)/(52) = 2880 (the correct answer) Am I just doing the first part wrong?

I understand now regarding electric potential and other scalars, thanks everyone. What doesn't work is finding the x and y components of the electric field and using pythagorean theorem to find the electric field at that point. This method should give an identical answer to using E=kq/r2 where...

Sorry, c is just the hypotenuse so electric potential at P (or electric field at P). Then why doesn't this method work with electric field, as it's a vector?

A scalar like electric potential. Say I have a positive charge, and 4m to the right, and 3m up is a point P. If I wanted to calculate the potential at point P, I'd use V=kQ/r (r=√(4^2 + 3^2)). But I'm confused about why finding the potential at 4m to the right (the x component), and the...

Say you have a rectangle with -Q charges at top left and bottom left corners, and +Q charges at top right and bottom right corners. Any point along a horizontal line in the middle will have electric field going to the left, but any point along this line will have a potential of 0. I've been...

I realize I need to be able to put it in a form of (b-a)/n Ʃ (a+(b-a)k/n), but I'm not sure how I can work with ln and manipulate it when everything is stuck in ln. Any tips?

Homework Statement Find limn->∞ (1/n)(Ʃk=1 to n ln(2n/(n+k))) Homework Equations The Attempt at a Solution I'm not sure if this is even a riemann sum at all, but I don't see what else it could be. I wanted to find the riemann portion first to get rid of the sigma notation then find the...

I'm not really sure what you mean.

Homework Statement Determine whether the sequence an = 11/n2 = 21/n2 + ... + n1/n2 converges or diverges. If it converges, find the limit. 2. The attempt at a solution I have no idea what to do with this problem. I don't see why I can't simplify n/n^2 to 1/n. It was suggested to me to...

Homework Statement Ʃ 4/(n(n+2)) from n=1 to n=infinity Homework Equations The Attempt at a Solution I tried using partial fractions to get A/n + B/(n+2), and I solved for A and B to get A=2 and B=-2 I tried summing them up, so everything would cancel except the first & last...

Could I use cos(phi) = R/Z? I'm not sure if (51.0 V)/(3.6 A) gives me the right resistance though. Z=R/cos(phi) Z=(51/3.6)/cos(75 deg) Z=54.7 Ohm, except this is the incorrect answer I got in the method I outlined in my original post. edit: or maybe since the given voltage and current values...

I found power already with P=Irms*Vrms*cos(phi) if that's the trick you mean. I'm not sure how to make phaser diagrams (haven't learned it yet), so I was hoping to just do it algebraically. Why do you say the known angle is +75°, wouldn't it be negative because its leading?

Homework Statement A series RLC circuit is connected across a 6.70 kHz source. The 1.50 H inductor and the 1.35×103 kohm resistor are fixed whereas the capacitor is variable. At what capacitance will the current in the resistor be a maximum? Homework Equations No idea.. The Attempt at a...

Homework Statement A circuit contains two elements, but it is not known if they are L, R or C. The current in this circuit when connected to a 51.0 V, 60.0 Hz source is 3.60 A and leads the voltage by 75.0 degrees. What is the impedance of this circuit? Homework Equations Z=sqrt(R^2 +...

Yea, I tried that, but kept getting the wrong answer =/ I think the value I listed was right after all, thanks!