# magnetic flux

1. ### How to find the charge at time = t (at any instant)

I was not able to derive the charge on the capacitor. But then, I arbitrarily assumed $\phi=B.A$ (Dot product of Magnetic field and Area) Then, proceeding as follows, $\phi=BA\cos(\omega_0 t)$ $\frac{d\phi}{dt}=−BA\omega_0\sin(\omega_0 t)$ Now at $t=0, \phi=BA\cos(0)=BA$ Therefore...

23. ### Flux in magnetic core according to special relativity

Hi, So say you have a magnetic flux in a closed magnetic path circuit (like a TX core). Well I mean we draw arrows and stuff to indicate how the magnetic flux travels, but after watching this: I'm having trouble understanding why there is any flux moving through at all. Can someone please help...
24. ### Stern-Gerlach Magnetic Field

1. Homework Statement For a Stern-Gerlach experiment, there is a apparatus designed to create a magnetic gradient. There is a dipole magnet. The radius of the convex pole is 5 cm, the radius of the concave pole is 10 cm. The convex pole as a 2 T magnetic field along its surface. (The apparatus...
25. ### Energy dissipated by a loop of muscle in an MRI machine

edit: turned out to be a calculator typo...mods feel free to delete this thread if you wish, I won't complain. 1. Homework Statement Having issues with part a) imgur link: http://i.imgur.com/4hzLyhb.jpg 2. Homework Equations Resistivity of muscle (from table in text): \rho \approx 13...
26. ### Trouble understanding - to + vs + to - current flow

1. Homework Statement When reading about directions of magnetic flux in relation to current flow on pages 6 to 8 of http://www.free-energy-info.tuks.nl/Non-Ferrous-Magnet.pdf , I found that in figure 11 the current is travelling from + to - terminals, while in figure 12, the current flows from...
27. ### Calculating multiple magnitudes for induced electric field

Let's say I place two different size conducting loops inside of a uniform magnetic field. For the sake of the diagram I have the loops share a point, but just treat them as though they are not touching. Then I decrease the value of the magnetic field very quickly. \frac{dB}{dt} =...
28. ### Calculate flux in a ferrite bead on a wire

Suppose that a ferrite bead is put around a cable where a constant current I flows, just like in this image. The coordinate system has the z axis along the cable. Let's evaluate the current through the (x,y) plane: according to the Ampère's law, the only magnetic field component generated by...
29. ### Are induced currents created by motion or change in flux?

The book I am working through is beginning to dive into induced currents and Lenz's Law. When a conductor is moving perpendicular to a magnetic field, the charge carriers inside will experience a magnetic force; This causes the charges to move. Eventually, the electric field from the charge...
30. ### Magnetic field created without an electromagnetic field?

Magnetic fields are less harmful than electric field and also a lot safer than being exposed to electromagnetic radiation. If data transfer is possible through magnetic flux then cancers and all those kind of diseases can be avoided. So, the question again is can a magnetic flux(movement of...