All Questions
38
questions
8
votes
1
answer
10k
views
Why doe we not get a shock on induction cooker?
In induction cooking, eddy currents in cook-pot cause heat to be produced. But why do we not get a shock?
Also, why is it that current is converted to heat while it has a good conductor(say, steel) ...
- 225
3
votes
0
answers
231
views
flux threading through superconducting ring
I have been confused over the wording used in this paper describing RSFQ logic circuits: http://www.mukhanov.com/uploads/LikharevSemenov-RSFQReview_IEEETAS91.pdf
From page 6: " If such a single flux ...
- 101
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
0
answers
65
views
Variation of Permeability with DC magnetising Field
For any Powder core, as DC magnetising field increases, the initial permeability decreases known as "permeability roll off".
For example for an MPP core-
For MPP cores the initial ...
- 21
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
1
vote
2
answers
315
views
Magnetic Field Produced by Solenoid
I was reading about solenoids and came to know that the magnetic field strength of a solenoid is greatly increased by
Increasing the number of turns in the solenoid coil (directly proportional to ...
- 229
1
vote
3
answers
821
views
Why does the current through an Inductor changes when the Inductor doesn't like the change of flux through it?
Consider the example shown above. Here we have connected an active inductor, in which the initial current is "I", to a resistance, with the help of a switch and close the switch at t=0. We ...
- 2,517
1
vote
2
answers
149
views
Intuition behind self-inductance
I'm having a little bit of a hard time understanding some concepts to do with self-inductance in class.
I understand mutual inductance. That's when a loop has some time-dependent current going through ...
- 187
1
vote
1
answer
164
views
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
224
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
1
vote
1
answer
330
views
Which method of calculating mutual inductance to use?
I am planning to make a wireless charging device for a school project using coupled induction. However, I have found a few different ways of calculating mutual inductance for coupled solenoids and ...
- 13
1
vote
2
answers
621
views
Paramagnetic material in a coil
If we hold the voltage constant, will (and how) the current through a coil change if we put a paramagnetic material in the coil ?
1
vote
0
answers
42
views
Please clear up the following confusion about Faraday's law, electromotive force, magnetic inductance, and current
As the magnet moves from the outside, the magnetic flux that is linked to the circuit is [pi_0 sin(wt)].
We have listed a series of processes related to electromotive force, self-inductance L, and ...
1
vote
0
answers
45
views
What is the flux linkage or inductance or induced voltage per unit length of the hollow tube conductor surrounding the inner conductor?
What is the flux linkage or inductance or induced voltage per unit length of the hollow tube conductor surrounding the inner conductor in some section due to the current in the inner thin conductor?
...
1
vote
1
answer
140
views
Do transformers return current to source when magnetic field collapse at primary coil?
When we close the circut containing an inductor and a battery, the current starts flowing, which builds magnetic field around inductor, changing magnetic field produces its own current in opposite ...
- 129