Recent content by oronanschel

look at 1 then 2 then there is 1+2 in the left side there are some derivatives , and variables transformation to explain

Homework Statement i have the divergence in the (x,y,z) Cartesian as \frac{dA_x}{dx}+\frac{dA_y}{dy}+\frac{dA_z}{dz} and the assignment is to transfer it to cylindrical system (r,{\phi},z), by any way i choose. Homework Equations tried with the chain rule, but i am doing...

I love physics thank u very much Daniel

it doesn't say what is the correct answer but it satisfy me. so any resistor is also charged (when connected to voltage)? sound weird to me because out of symmetry why it would be charged positively and not the opposite?

becasue E is E(x), can i say that \overrightarrow{\nabla} \cdot \overrightarrow{E} = \frac{\rho}{\epsilon_0} is \frac{dE(x)}{dx} = \frac{\rho(x)}{\epsilon_0} ? then problem is solved

yeah..oops, this is the second question and I managed that one I know the formula : \sigma E = j (Local variation of Ohm's law) the 3rd question was the charge density in the center of the resistor that i couldn't figure out..

Homework Statement given simple circuit with V the voltage connected to a resistor with area A, length d and electrical conductance: b*e^-2x/d after my computations the resistance R=d*(e^2-1)/(2bA) Homework Equations what is the electrical field E in the center of the...

if it was 2d then it an obv that B (because distance is shorter) but i can't get a grasp of it 3d and could't compute either. i tried to think what is the shape of the field of half sphere but couldn't do it either. the weird thing is that, the book argue that the net force is the same and i...

given to solid half charged sphere Insulators. In which state the mutual net force is bigger: A/B/the same

Homework Statement i tried to compute the electrostatic field of a charged ring at a point not in the center i have problem with transforming from xy to polar system what do you think about this try? Homework Equations The Attempt at a Solution

Homework Statement given two coils one with N1 rings legnth L1 the other N2 L2, one inside the other the radius is not given.. N1 is connected to battery V1 and N2 is connected to volt-meter what will show the volt-meter? (use N1,L1,N2,L2.V1) Homework Equations Faraday's law of induction[...