Recent content by JustStudying

I'm learning about properties of Fourier transforms at the moment, and I've come across 2 terms "time-scaling" and frequency shift. A quick google search of time-scaling suggests that it is when I make the period of my signal longer (i.e a sine wave would take longer to finish 1 cycle) but...

I hear this term a lot but couldn't find much from a google search My initial guess is that we put a AC current through a inductor coil to create a magnetic field. Am I close?

So we have a cross sectoin of a sphere that is charged with Q (refer to attachment). electrostatics say the electric field within a charged conductor is 0, and the electric field is perpendicular to the surface. But for a hollow charged sphere (like in the attachment), does the hollow area...

So I am at the point in my electrical engineering degree where I get to choose electives, but because I feel like I'm not fully familiar with the classes I can choose from.. I've got a few questions: 1. what is radio systems about? Google tells me its about FM/AM radio broadcasts 2. do...

Can anyone explain why saturation current and flux leakage are not related? saturation current = current where all the magnetic domains are aligned right? flux leakage = flux from the primary that doesn't reach the 2ndary can someone also explain why, flux leakage causes a increase in...

Homework Statement If electric flux density (D) is given by the vector (xy,yz,xz) then calculate the displacement current density Homework Equations Jd = dD/dt The Attempt at a Solution if you differentiate D, in terms of t, then you just get 0..but that apparently isn't the answer

I haven't seen anyone derive the magnetic field density (B) using ampere's law, only using Biot-Savart Law any reason why? if we cut the loop and loop at one end (of the new cut) and treat it as if it was a current carrying wire, then by ampere's law we'd get: B = u*I / 2*pi*r but...

I was hoping if anyone could explain why there are TWO points where the potential is zero i.e I simply don't get why the potential is zero at the red cross - the 3q charge is not even in region III so how could it cause a zero potential there?, the actual number crunching isn't too difficult.

Homework Statement i'm having a bit of trouble understanding/visualising why the electric potential is zero in the red cross within region III and the green dot within region II from my current understanding, the green dot is where the potentials from both charges are equal and...

So I've been wondering.. from my previous post: https://www.physicsforums.com/showthread.php?p=4500082#post4500082 if we have a plane of infinite charge, then electric field does not depend on distance however, for a infinite line of charge: If we use a cylinder with radius 'r' as our...

reading this page : http://hyperphysics.phy-astr.gsu.edu/hbase/electric/potsph.html it says "The electric field inside a conducting sphere is zero, so the potential remains constant at the value it reaches at the surface:" if the electric field inside the sphere is 0, then wouldn't that...

I was doing a problem: An infinite conducting plane has a uniform surface charge density of 30 μC m‾². Find the electric field strength 7.0 mm from the plane. so we can use a gaussian surface (e.g a cylinder), and come to the conclusion that E = 30 μ / ε but that got me thinking...

but according to faraday's law, if we have a changing flux, and N amount of coils, we'd end up with more voltage induced if we have N turns - so more voltage induced = more current ..so wouldn't N have an effect on current

hmm, so then the N pole of 1 loop will join up with the S pole of the next loop, but their total flux is the same as the total flux in 1 loop?

then the all the flux from each individual coil add together as they are in same direction, and you would get more current flow (with them all together, vs having 1 loop on its own)..right?