Recent content by elyons

Thanks! The spatially dependent case clears up my confusion.

Thank you for the response, I think this helps me narrow down my confusion a bit more. This makes sense for a 'charge and current' free region as you are showing, that an externally produced E field would not result in any long term charge in a homogeneous material. I think my confusion is that...

In a chapter building up to the theory of plane waves my book starts by introducing time harmonic electric fields and defines a special case of Gauss's law.curl(H) = J + dD/dt curl(H) = sigma * E + epsilon * dE/dt if E is time harmonic and spacially dependent... E(x,y,z,t) let E' represent the...

I figured it out! In case anyone gets held up by something similar, By paying attention to the symmetry property of DFT for a real valued input X(n) = X*(N-n) where X represents the DFT coefficients and N is the fundamental period, in this case 10, the remaining coefficients (n = 6:9) can be...

Problem: The first six values of the 10-point DFT of a real-valued sequence x(n) are given by {10, −2 + j3, 3 + j4, 2 − j3, 4 + j5, 12} Determine the DFT of x[n] = x[n+5] (10 point sequence) Relevant Equations: DFT(x[n-m]) = exp(-j*(2pi/N)*k*m) * X(k) where N = 10 ; m = -5...

Homework Statement A 5.5 cm radius conducting sphere is charged until the electric field just outside its surface is 1667 V/m. What is the electric potential of this sphere, relative to infinity? Homework Equations V = - integral ( E (dot) dl ) The Attempt at a Solution They only...

The problem is about electric fields towards the beginning of my second quarter of general physics. There are two equal but opposite charges connected by a conducting wire. the Wire is bent in the shape of a U and there is a massive negative charge (relative to the other two) very close to the...

The tangential acceleration in terms of a fixed coordinate system. The velocity is accelerated to 0 as a point on the tire approaches the point of contact on the ground and after it reaches the point it is accelerated positively to increase the velocity of that point again. So at the instant the...

So the acceleration hits zero because it is changing from negative to positive but has an identical magnitude on both side of the point of contact? So the point has a tangential acceleration relative to the center of the wheel just not to the ground?

A car is moving foreword with a constant acceleration. I know the point of the tire in contact with the ground has a velocity of 0 (relative to the ground). Is the tangential acceleration at this point also zero? I came across an example problem in my text where this occurs and and it does not...