Recent content by fishingspree2

Is it a matter of conventional current vs electrons flow?

If I understand correctly, Gauss's law is for a surface off which someone walking could never fall. Like the Earth for example. Whereas Faraday's Law is for surfaces like when we thought the Earth was flat. Is that correct?

I was reading here https://www.physicsforums.com/library.php?do=view_item&itemid=294 gauss law's for magnetism says ∮B⋅dA = 0 but then faraday's law has d/dt ∮B⋅dA in it. Well if its 0 then d/dt of 0 is 0.

Homework Statement http://img805.imageshack.us/img805/6030/82154948.png Find Vemf (between points 1 and 2) and it's polarity at t = 0. I have omitted details because my question is specifically on the polarity.Homework Equations Lenz's law: An induced electromotive force (emf) always gives...

Any idea what am I missing?

If i use the fact that a X b = |a| |b| sin(theta) then I understand where the sine comes from, it this case it would also mean that z X R is in the φ direction if d\vec{l}\times \hat{R}=\hat{\phi}\sin \left (\theta \right )dz is correct. but when I compute z X R using the 3x3 matrix R φ z 0 0...

In my physics textbook we have d\vec{l}=\hat{z}dz and then it says d\vec{l}\times \hat{R}=\hat{\phi}\sin \left (\theta \right )dz How so? What is \hat{z}\times\hat{R}? If it is \hat{\phi} then where does the sine come from?

I found that d\overrightarrow{l}=dR\overrightarrow{R}+Rd\phi \overrightarrow{\phi}+dz\overrightarrow{z} so V_{B}-V_{A}-\int_{A}^{B}\overrightarrow{E}\cdot d\overrightarrow{l}=-\int_{R_{A}}^{R_{B}}\frac{18}{R^{2}}dR=\frac{18}{R_{B}}-\frac{18}{R_{A}} is that correct? in that case it seems my...

Some questions... I'm trying to compute V between two general points for the given E field, just to see what it will give and also for the sake of it. We know that Vb-Va = -\int_{A}^{B}\overrightarrow{E}\cdot d\overrightarrow{l} any idea how I could express d\overrightarrow{l}...

Homework Statement Given the E field E = 18/R2 R, R is the radial direction. Find the electric potential between A and B where A is at +2m and B at -4m, both on the z axis. The Attempt at a Solution My question is, since E field depends only on R, the distance between the point and the...

Homework Statement We have a sheet of charge, which is infinite in the x direction and has width d in the y direction. Find E field at a height h above the center line of the sheet. The sheet has λs surface charge density. My attempt: We know that the E field for an infinite wire is λl / 2πrε...

I am trying to compute -dx i CROSS -x i -y j i,j,k are the unit vectors x is from -∞ to ∞ and y can only be negative. Right hand rule tells me that the cross should be in the negative k direction but computing the cross product gives me y dx k. What's wrong?

Whenever I argue with people and they resort to logical fallacies, I get extremely frustrated and even violent. I have no problem accepting different opinions as long as they are defended in a logical way. What ticks me off specifically is logical errors, fallacies. I can't stand when logic...

We know that ∇.D = ρV My question is, if D is due to a linear or a surface charge distribution, can we apply this equation and get a surface or linear charge density? Thank you very much

Hello, please take a look at the first 2 minutes of this video: He says that we compute the E field, so when we put a charge anywhere, we can know what will happen to the charge because we know the E field due to the other charges. But wouldn't the added charge disrupt the force...