All Questions
13
questions
1
vote
0
answers
127
views
Coilgun projectile force calculation
Please excuse me if I am completely wrong because I am a 9th grader but I hopefully am able to explain briefly about my problem. I was trying to create a function to calculate the Force of an iron ...
- 11
0
votes
1
answer
126
views
What provides energy in mutual inductance to unconnected coil
In this mutual inductance setup:
when current is passed through coil 1 the flux through coil 2 changes for a short amount of time which induces a current in coil 2 the direction of which, in ...
- 105
0
votes
1
answer
95
views
Forms of energy in a closed circuit with a coil
I am a bit confused. When i move a magnet through a coil thats in a closed circuit, what does my kinetic energy convert to?
I assume I will create a magnetic field, and that magnetic field will create ...
- 15
0
votes
0
answers
122
views
Self-inductance, back EMF and energy stored in magnetic fields
First let's talk about self inductance. A current-carrying loop produces a magnetic field which in turn produces a flux through the loop. If this current is increased, the flux changes as the magnetic ...
- 453
0
votes
1
answer
97
views
How an inductor lose energy when pulling iron
I'm confusing with a problem.
Consider an ideal inductor with a shorted circuit and no resistance and having a current through it. we know this current is constant while the inductor has no resistance ...
0
votes
1
answer
74
views
Energy stored in an Inductor is used to move electrons
I was reading about the energy stored in an Inductor and first of all I had the question that is this actually stored? The inductor produces a magnetic field which exerts a force on electrons. Isn't ...
-1
votes
1
answer
89
views
Why integration? [closed]
This is the expression of an energy stored in an inductor, i know it came from integrating inductance (as a constant) and current with respect to time, but my question is why it was integrated? What ...
- 1
0
votes
1
answer
745
views
Energy Loss in an Inductor
I have a question about an ideal inductor. I understand the induced EMF due to moving charge and the more turns of an idealized inductor the higher the non-conservative induced emf is opposing current....
- 5
1
vote
0
answers
56
views
Velocity of an Object Accelerated by an Inductor
I am currently trying to build a coil gun as a class project (for an introductory programming/electronics class), and I want to be able to determine the launch angle necessary to send an object a ...
- 121
3
votes
2
answers
845
views
Energy stored in the magnetic field
While deriving energy density of a magnetic field via using an inductor, why dont we consider the energy stored outside of inductor also?
As initially the field was there outside the inductor, (may ...
- 451
2
votes
1
answer
841
views
Explanation of force amplification inside a solenoid
For a system being actuated by a motor, the force can be amplified by gearing. The energy is being used for force instead of distance, so it produces more torque but moves slower.
For a system being ...
- 301
2
votes
1
answer
235
views
How can we define the energy stored in a (conservative) force field?
I have come to know from my textbook that energy is stored in the E-field of a capacitor, in the B-field of an inductor and so on. Take the example of an inductor. The derivation bewilders me ...
- 380
10
votes
5
answers
10k
views
Magnetostatic energy density -- derivation without introducing inductance?
I was looking for a derivation of the expression for the energy density at any point in a static magnetic field. I do know that it is
$$u_B=\dfrac {1}{2 \mu_0}\left|\mathbf{B}\right|^2,$$
I was just ...
- 625