All Questions
37
questions
0
votes
3
answers
69
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Are there losses in an ideal transformer?
In a circuit with an AV power source $V$ and a zero-resistance ideal coil, the power from the source. $P_{in} = IV$ is equal to the rate of change in the magnetic energy $U_B$ stored in the coil. The ...
- 2,142
1
vote
0
answers
54
views
Static toroidal magnetic field rotating inside toroidal winding
what would happen if I took a toroidal core, generated a static toroidal magnetic field in the core and then rotated the core around it's symmetry axis within a larger stationary toroidal winding ...
- 91
0
votes
0
answers
19
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Effect of projectile movement inside the coil launcher
I'm simulating a simple coil launcher system where there is a round coil , a capacitor and a round projectile which at first is placed at the start of the coil.
so the whole circuit is a simple RLC ...
1
vote
1
answer
254
views
Does the electric field ($E$ caused by induction) of a moving conductor in a magnetic field drop when connected to a curcuit?
We know that when a conductor moves in a homogenous magnetic field that is perpendicular to itself due to the amount of electric charge gathered on one end of the conductor( as a result of the lorentz ...
0
votes
0
answers
118
views
Back emf for simple DC motor in radial magnetic field
With a basic DC motor setup of a single coil spinning in a linear magnetic field, the back emf produced is a sin wave, as the change in the angle between the plane of the coil and the magnetic field ...
- 135
1
vote
1
answer
163
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Calculating Induced EMF in Wireless LED Circuit
I have built the following circuit to power a wireless LED and my calculations and measurements do not give the same values. I am measuring a voltage nearly 6 times larger than I would expect in my ...
- 113
1
vote
2
answers
223
views
Doubling the length of a solenoid doubles its inductance. Two identical solenoids in series have up to four times the inductance due to M. Why?
The inductance of a long solenoid with $N_o$ turns and a length $l_o$ is
$$L_o=\pi r^2 \mu_0\frac{N_o^2}{l_o}$$
If I now make a new solenoid, $L_{new}$, with double the length of the original ($l_{new}...
- 1,581
2
votes
2
answers
635
views
INDUCTANCE depends on the number of turns in a solenoid. Is this the case with RELUCTANCE as well?
The total flux ($\Phi$ ) through an solenoidal inductor of length $l$ and $N$ turns is proportional to the current through the inductor and the inductance $L$ of the inductor according to
$$\Phi =L \...
- 1,581
1
vote
0
answers
38
views
Modeling the Effect of Magnetic Induction on Single Neurons
In this paper, the authors suggest a potential mechanism for magnetoreception in birds: as the Earth's magnetic field (taken to be homogeneous over sufficiently small spatial scales) passes through ...
- 359
5
votes
2
answers
763
views
How does electromagnetic induction work on an atomic level?
So far I have come to know that changing magnetic field (or flux) creates current. This is also known as Faraday's law of electromagnetic induction. The direction of the current is opposite to the ...
- 817
2
votes
1
answer
142
views
What is the emf in this circuit?
There is an infinite solenoid with radius $r$ inside the first loop powered by a current that changes over time so that the magnitude of the magnetic field inside the solenoid is $B(t)$. According to ...
- 1,989
0
votes
1
answer
89
views
Induced emf of a moving rod with certain velocity
I am calculating the emf of a moving rod with velocity $v$, given $v$.
My approach is to multiply
$$Blv$$
Where $l$ is the width and $v$ is the rate of change of the length.
But then I found out ...
- 103
0
votes
3
answers
373
views
Why is there no conduction current $i_C$ through a surface between capacitor plates?
The image is from Young and Freedman's University Physics with Modern Physics, Chapter 29 (Electromagnetic Induction).
The image shows a parallel plate capacitor being charged where the current ...
- 155
0
votes
1
answer
156
views
Why is there no EMF induced or flux change of the left ring zero? [closed]
I tried by dividing the system into three parts, and flux is increasing for the left most and right most part and decreasing for middle, but am not able to arrange this in form of a battery, any help ...
1
vote
3
answers
987
views
Induced current in a closed loop in opposing directions
When a magnetic field is given to the loop as in the figure(sorry for the horrible drawing);
I'm told that there will be an anticlockwise current induced in both the 'inner' and 'outer' loops, ...
- 256