All Questions
5
questions with no upvoted or accepted answers
3
votes
1
answer
1k
views
Distribution of current of a rotating cone
If I have a hollow cone (surface with no bottom cover ) as the one in the picture. The cone has surface charged density $\sigma$. It rotates around the symmetry axis with an angular velocity $\omega$. ...
- 738
1
vote
2
answers
3k
views
Transformers: How does current in primary coil change?
I was doing a question on transformers and found this really confusing question:
A 100% efficient transformer converts a 240V input voltage to a 12V
output voltage. The output power of the ...
- 11
1
vote
0
answers
159
views
Electrical resistivity calculation of a cylindrical material
I have a copper rod, its diameter is 13mm, and its height is 13mm. I want to check its electrical resistivity. I have tools to give this copper a constant current by two points (the two black dots in ...
- 111
1
vote
0
answers
92
views
Drift velocity in Silicon wafer
I have been asked the following question in a problem sheet:
A $100mm$ diameter, $0.5mm$ thick silicon wafer at room temperature has a charge carrier
density of $1.5×10^{10} cm^{-3}$. A potential ...
- 349
0
votes
1
answer
89
views
What's the magnetic field produced by a current carrying circular loop at a point on its plane?
How do I find the magnetic field in this case? I already know about the magnetic field produced by a current carrying loop at an axial point or center but what about the point on its plane?
- 11