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Results tagged with electromagnetism
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user 96487
The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.
0
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2
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110
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Can an electric field be there without a charged partical?
How does a photon have an electric field around itself without any charge particle inside it.
- 2,111
-1
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3
answers
4k
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Effect of magnetic field on stationary charge
Consider a long infinite current carrying wire in N-S direction.
Consider a charge +q at a distance of r from wire.
Clearly, Lorentz force on charge is 0.
But, their is a relative motion between ch …
- 2,111
3
votes
Accepted
Current electricity: the drift velocity
Electrons are accelerated for very small time
(the relaxation time) ,then they collide with other electrons in metal.
The relaxation time is nearly same and constant for each such collision.
During th …
- 2,111
3
votes
2
answers
115
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Has such experiment been performed before?
Consider a charge of 1C kept a distance of $6*10^8$ m from a detector.
I find electric field due to this charge at detector.
Then, I suddenly earth that charge
and not the time it takes to be detec …
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0
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Accepted
Magnetic field of a current carrying wire reduce/increase exterior magnetic field?
B should remain since Magnetic
field is added in upper part and equally
subtracted in lower part.
Hint: Wire does not experience its own magnetic force.
If you let wire to accelerate in $B$ freely …
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0
votes
Two Jumping Rings Go Higher than One. Why?
Update:
Please refer this(248KB)
http://www.google.co.in/url?q=https://www.grinnell.edu/sites/default/files/documents/tjossem_and_brost_optimizing_thomsons_jumping_ring.pdf&sa=U&ved=0ahUKEwjftbLBhf7 …
- 2,111
0
votes
2
answers
1k
views
Electric field around a moving charge
A moving charge has magnetic field around it.
Is it just increased electric field in relativistic frame?
If yes, does a moving charge has more electric field around it?
Update: One shall take conse …
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2
votes
2
answers
2k
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Proton and electron joining [duplicate]
If I have a proton and an electron at rest at some distance apart.
Will they form an hydrogen atom when released or they will join together?
My intuition says it will form H atom.
But I cannot expla …
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1
vote
What is the reason behind the shape of the magnetic field lines in a circular loop?
(source: gsu.edu)
Do you know a straight line is a circle with infinite radius.
Similarly at centre you get a circle with infinite radius.
When wire is bent in form of circle, magnetic field is …
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3
votes
2
answers
2k
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How can we apply Ampère's circuital law in a wire?
How can we apply Ampere's circuital law in a wire to calculate magnetic field around a straight current carrying wire? The length of the wire is not infinite.
Using the Biot-Savart law we get
$$B = …
- 2,111
0
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Short Circuit Fires
power dissipated is more correctly given by H = I^2 RT.
a normal wire or gadget has nearly constant resistance. Before short circuit, a little amount of current flows through it which gives minimal p …
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1
answer
2k
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How is momentum conserved in magnetic field? [duplicate]
In a uniform perpendicular magnetic field , force on charged particle cause change in direction of momentum. How do we explain it using conservation of momentum?
I don't know what is Hamilton or cano …
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-1
votes
Accepted
Transfer of electrons and static electricity
your body and your door knob both ate positively charged. Only some of your positive charge is transferred to door.Difference is that your body is now less positive.
Negative charge on carpet is as it …
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4
votes
2
answers
361
views
What is relationship between electromagnetic mass and rest mass?
Is there a direct equation which compares rest mass $m_°$ and electromagnetic mass $m_{em}$?
Nothing on web I found.
$m_{em} = \frac{4 E_{em}}{3c^2}$
4/3 problem
The final solution of the probl …
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1
vote
When current passes through a wire, does it only travel through the outer surface?
When you give charge to any sphere like above, charge first spread throughout the conductor and not only surface.
A current flows inside conductor moving electrons and changing electric field in con …
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