# All Questions

315 views

### Magnetic scalar potential far above a magnetic film

The situation I am looking at is a magneto-static problem of a finite magnetic film with magnetization $\bf{M}$. I would like to find the the magnetic field far above the plate. My expectation is that ...
278 views

### What is the general relativity explanation for why objects at the center of the Earth are weightless?

The idea that as you move through the earth you get a symmetric cancelling of gravitational acceleration which approaches zero acceleration due to gravity at the center of the earth makes a lot of ...
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### What do you actually mean by DC current gain and a AC current gain in transistors [duplicate]

What do you actually mean by DC current again and AC current gain? I know there for formulas but I did not understand what actually they are , what is the significance. So basically I do not ...
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### Speed of different colours of light [duplicate]

Speed of light is different for different colours. What does the speed of a particular colour of light depend on? Which colour of light has the highest speed?
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### In causal dynamical triangulation, what equation(s) give the distribution of angles of the triangles?

I know very little about this topic, but going on what I learned in my one semester of QM, there has to be some Schrodinger-like equation they are using to get the distribution of angles of triangles ...
The Riemannian metric is expressed in complex coordinates as $$ds^2=g_{ab}dz^adz^b\hspace{3cm} (1)$$ My question is why do we seek a Riemannian metric? And is this a rule that we can write the ...