All Questions
8
questions
5
votes
2
answers
1k
views
Does the EMF of a battery change with time?
OK, so... I know that batteries provide less and less energy with time. My question is- is that a result of a decrease in the EMF of a cell or an increase in the internal resistance of the cell or ...
- 153
0
votes
1
answer
77
views
Recreating Millikan's Photoelectric Experiment
I am designing a set-up to recreate Millikan’s Photoelectric Experiment, which is similar to all the standard online simulations. I hope to achieve this without using a vacuum as it is very expensive ...
- 43
1
vote
0
answers
94
views
Investigating the relationship between a changing B field and the curl of the electric field induced
I am currently working on a 12 page lab report on Faraday's law, essentially investigating, how for different magnetic field strength through a stationary loop of wire with N number of turns, effects ...
- 225
14
votes
4
answers
4k
views
Kirchhoff's Voltage Law in a General Electromagnetic Field
Recently, Prof. Walter Lewin and YouTuber ElectroBOOM started a discussion about KVL, after Dr. Lewin claimed that KVL did not hold in the presence of an magneto-dynamic field. I would argue that Dr. ...
- 1,043
0
votes
1
answer
34
views
Effect of near zero temperature in ac transformer
Would there be any variation in the usual ac transformer behavior if one of the coils (namely, the primary coil) - or both - was made of a superconducting material (i.e: lead) and cooled to near zero ...
1
vote
0
answers
463
views
Different phase in capacitively coupled RLC circuits
I was trying to work with some data for a lab report I'm writing about capacitively coupled RLC circuits.
The setup is pretty simple and looks like that:
Where $C^{'}$ is the coupling capacitance.
I ...
- 125
0
votes
1
answer
3k
views
measuring electromagnetic induction
There is a famous law which says that a potential difference is produced across a conductor when it is exposed to a varying MF. But, how do you measure it to prove? It is quite practical.
...
- 1,013
15
votes
6
answers
30k
views
How do you determine power flow direction in a transmission line?
Below is a picture of a typical transmission line(about 200 kV). Is there a simple physics experiment which can be performed safely near the line, to determine the power flow direction. Or in other ...
- 2,697