All Questions
37
questions
8
votes
6
answers
2k
views
How does an inductor store magnetic energy?
I am trying to figure out what the potential energy of an inductor with a current really means. In a capacitor, the energy stored works like this: if you let the plates attract each other, before ...
- 669
7
votes
2
answers
860
views
What is the meaning of Potential Difference in presence of Non-Conservative Induced Electric Field?
Case 1
This is a very commonly discussed case in Electromagnetic Induction. In the case above, we need to find out the potential difference across the rod CD, in the presence of time-varying ...
- 2,517
5
votes
2
answers
766
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
4
votes
2
answers
3k
views
Cause of electromagnetic induction?
The rate of change of magnetic flux through a surface (open) is related with the line integral over the closed loop binding the selected surface by one of the Maxwell's equation. But that means even ...
- 3,148
4
votes
2
answers
2k
views
Why is there no induced electric field in the experiment (Faraday's Law)
Below are three circuit diagrams for each of Faraday's experiments that allowed Faraday to come up with Faraday's Law. In Griffiths' Introduction to Electrodynamics Griffiths states (on page 302 of ...
- 518
3
votes
1
answer
740
views
Explaining how a magnetic field affects currents in a conductor, in the limit of high conductance
Recently, I gave an answer to this question,
explaining my intuition on how much electric field impinges into
a good conductor under certain conditions, in order to reason about the limit of
perfect ...
- 1,379
2
votes
2
answers
483
views
Energy Conservation: How is Heat generated in a loop with Time Varying Magnetic Field through it?
Consider a circular loop kept in a time-changing magnetic field. We know, via Faraday Law, that EMF is induced across the loop and hence a current appears in the loop. Let there be some Resistance ...
- 1,568
2
votes
2
answers
641
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
$$\Phi =L \...
- 1,581
2
votes
1
answer
142
views
What is the emf in this circuit?
There is an infinite solenoid with radius $r$ inside the first loop powered by a current that changes over time so that the magnitude of the magnetic field inside the solenoid is $B(t)$. According to ...
- 1,989
2
votes
2
answers
3k
views
What is total magnetic flux through a coil?
According to Gauss's law of magnetism, the total magnetic flux through a closed surface is zero. But during induction, we study that the magnetic field lines passing through a coil change, as does ...
- 329
2
votes
2
answers
17k
views
How doI find the average induced emf in a coil given the rate of change of flux density, and the area of the coil?
The magnetic flux density changes from +10 T to -10T in 5 seconds. The area of the coil is 2.5 m^2. What is the average emf induced?
By Faraday's law, this will be equal to the change in magnetic ...
- 254
2
votes
2
answers
109
views
Inductor circuit
Consider a inductor circuit with an inductor connected to a DC battery and a switch. Initially the switch is open.
At time $t=0$ the switch is closed. What will happen to the inductor just after the ...
- 21
2
votes
5
answers
5k
views
Can pulsating DC current be transformed?
Since pulsating DC current is changing, why doesn't it induce a changing magnetic flux in the transformer core? Is it able to induce a transformed current in the secondary coil?
- 91
2
votes
1
answer
290
views
Mutual inductance - induced magnetic flux in the primary
Let there be two coils, L1 (with self inductance L1), and L2, with self inductance L2.
The first coil is connected to a sinusoidal supply, and the second one is connected to a resistor load, as shown ...
- 21
2
votes
0
answers
84
views
How do you apply "flux-rule" in free space?
Faraday's law of induction states that, the tangential component of the force per unit charge$^*$; EMF produced in a loop of wire, is equal to change in the magnetic flux through the loop,
$$\int_C \...
- 455