All Questions
13
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
39
views
Electromagnetic induction with a two-magnet assembly
I performed a bunch of experiments where I let a two-magnet assembly free fall through a vertical solenoid. The magnets are shaped like rings, are identical in size, and are held in place - with a ...
0
votes
0
answers
63
views
Is it possible to compress valence electrons within a copper wire using two electric fields?
I am wondering if the free electrons within a straight copper wire could be compressed towards the center of the wire with the use of two electric fields created by two sets of parallel plates.
I ...
user255577
1
vote
1
answer
401
views
What was Faraday's experiment's of induction?
I'm searching about the experiments, which Faraday has done in order to discover the electromagnetic induction phenomenon. I didn't find what I need on google scholar nor google books. Can you ...
- 13
2
votes
1
answer
100
views
Why does the theory and practice differ?
Let's consider a vacuum diode with cylindrical electrodes.
A voltage is applied to cathode, so there is an electric field between cathode and anode. Also there is a magnetic field $\mathbf{B}$ ...
- 23
-3
votes
3
answers
1k
views
Is it possible to use the physics of a pendulum to generate Electricity
Say we have a friction less pendulum and it extends over a 1/2 of a foots length with 3 bobs. These bobs are kept in motion by magnets of the opposite force that have been placed on a metal tray that ...
0
votes
1
answer
451
views
Forces between current carrying wires [closed]
Why the wires bearing current in the same direction don't attract to each other?
- 17
1
vote
1
answer
171
views
Experiment: releasing the copper bar above a permanent magnet
A classic experiment shows that when we drop a magnet through a copper coil long tube, there is eddy current induced in the coil. Then, due to lenz law, the motion of the magnet will be opposed and it ...
- 579
0
votes
1
answer
101
views
A confusion with solenoidal windings
I have seen in solenoids, toroids, transformers, electromagnets and machines that the core is pretty insulated. Over this the winding coil is wrapped but it is a bare coil (turns are not insulated to ...
- 115
0
votes
3
answers
8k
views
Inductor Charging and Discharging
Why does the inductor discharges in the same path ( same direction of current ) as that of its charging unlike a capacitor which discharges in the direction opposite to its charging(current direction ...
- 26
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
131
views
How magnets create electricity in conductors?
what are the reasons for current appearing in a wire when wire is in a changing magnetic field?
- 195
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