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Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
ZapperZ
1 45,886
Hi, Question: we have a magnetization M_x that varying as M_x(t)=M_x e^{-t}.Threre is a coil on the x axe. The...
Apr11-12 03:50 AM
DrDu
26 2,082
I've just got confused about how the induced current in a metallic ring is calculated. Consider a metallic ring...
Dec14-12 06:00 PM
Enthalpy
2 516
Hi there, When you have a loop of wire and you move a bar magnet through it, you induce a current in the wire. ...
Jan22-11 03:36 PM
tiny-tim
1 1,014
Hi all, I am having a hard time understanding the following scenario (I'm quoting from page 305 of the "Electricity &...
Feb23-08 07:24 PM
david20
5 10,706
Hi, I'm a bit confused by induced drag on an aerofoil and hoping somebody can clear it up for me. I understand...
Mar9-13 02:39 PM
rcgldr
3 617
Imagine a solenoid with n turns per length. Now, for an instant, in which everything looks static, the magnetic field...
May30-07 04:51 PM
Meir Achuz
7 2,671
If I have a B field in between two current carrying sheets and I approach this moving at a constant speed. And I have...
Apr29-11 03:48 PM
cragar
4 632
I am a high school student, so forgive me if my question appears stupid. Consider a uniform magnetic field normal...
Apr5-10 02:40 AM
Phrak
42 5,217
Can electric field be induced at a point near a time varying uniform magnetic field? "Near" means not the in the place...
Dec20-12 09:35 AM
dev70
14 1,713
I've just seen induced electric field concepts. Could anyone provide a link, which explains it? I had some rather...
Sep24-09 04:19 PM
Bob S
1 2,086
suppose there is a region S through which the magnetic field changes with time then is the electric field induced...
Nov17-07 12:21 PM
Crosson
7 1,565
Hi all, I am looking into induced electric fields by changing B fields inside layers of dielectric. For example, if...
Jul8-14 05:13 AM
vanhees71
10 1,031
induced Induced EMF ( 1 2 3 ... Last)
well iwas going through the standard example that is there is a uniform magnetic field in aregion going into the palne...
Aug27-07 07:09 PM
Paulanddiw
59 7,506
A circular loop of wire has a changing magnetic field running through it...however, the magnetic field is not touching...
May18-08 01:53 AM
Dozent100
25 3,607
Suppose now i have connected a solenoid with a dc power supply of 10V When i increase the voltage to 20V the magnetic...
Dec18-10 03:05 AM
whitegheghe10
0 570
I know the equation for emf: -dflux/dt= -dB/dt*A . In my case everything is constant accept the magnetic field and I...
Apr24-11 07:14 PM
laxmaster08
28 2,415
Faraday's law says that an induced voltage across a conductor is directly proportional to the rate of change of...
Jan31-11 11:50 AM
cabraham
2 3,871
ok, if i have a rectangular loop parallel to the screen and in a uniform constant magnetic field pointing...
Mar25-10 05:11 AM
quietrain
7 1,775
Hello, While considering Faraday's Law of Induction, I tried to think of a situation which would expose some...
Jan22-12 03:26 PM
Philip Wood
8 1,967
Hi everyone, This question is bothering me for days and would hope to receive some help in this forum. This...
Jul28-11 08:30 AM
Philip Wood
21 5,916
I am having some trouble understanding why and how the emf changes when a bar magnet is dropped into a solenoid. As...
Sep26-12 05:06 AM
Philip Wood
5 1,435
According to "Introduction to Electrodynamics" - Griffiths I have a few questions about the bolded section ...
Jan24-10 05:33 PM
Identity
0 647
Hello, Say I have two concentric conducting rings, where r1 >> r2 (why is this important, btw?), and I run a time...
Oct18-11 03:45 PM
dudy
4 905
Excuse me, can anyone teach me how to calculate the induced magnetic moment of steel, given the applied magnetic field?
Jan19-06 11:16 AM
Gokul43201
5 3,627
My classmates had an argument. There are 2 trolleys; one of them (A) is attached to a solenoid wrapped around a...
Jun14-11 02:16 PM
BruceW
9 1,788
Hello. Say I have a single turn of a coil in an external magnetic field. How do I calculate the voltage induced in...
Nov20-12 06:55 AM
Enthalpy
5 1,042
I have recently found a circuit schematic that can pick up radio signals without the need of a battery. Is this an...
May30-11 07:14 AM
mavc
15 2,776
Hello. I'm am studying topics related to inductances and Faraday's law and I'm having hard time at PICTURING...
Oct20-11 04:02 PM
BrunoIdeas
3 1,702
what is the value of e.m.f acting upon charged point particle situated at the centre of a circular coil carrying a...
Mar11-11 02:52 AM
cragar
1 867
I am interested in creating an electric circuit that travels through a polyurethane surface. My plan is to set up two...
Jul10-12 03:29 PM
Naty1
3 621
I just have some confusion about whether or not self-inductance will occur in an AC generator. The current is...
Jun14-09 10:12 PM
Yuqing
0 1,324
I want to create a simple circuit consisting of a power source and an inductor. I have a simple circuit consisting...
Jul24-12 06:36 PM
256bits
2 716
Hi everyone, I encountered a problem as a part of the solution of which I needed to get the i-V relation across a...
Nov27-12 06:13 AM
Gordianus
5 1,588
Dear all, I am trying to calculate the inductance increase of a small ferrite rod placed in the middle of a...
Nov25-13 09:27 AM
paujuan
0 408
According to widely known formulas, the inductance of a long straight solenoid will remain practically the same if we...
Jul31-10 02:16 PM
htg
2 1,985
I've got the probem with determination the formula of inductance in the toroidal coil. This coil has a shape of...
May25-10 07:35 PM
borsuk
0 1,063
I posted this question a few months ago, but got no responses, especially after it got moved to the homework help...
Jul16-10 10:15 AM
DaTario
2 970
suppose a rod of mass m and resistance R,is going down the inclined surface in the uniform magnetic field( see...
Mar31-11 02:47 PM
zorro
5 694
Lets say you have a plastic plate with little charged balls around the edge. in the middle there's a coil with a...
Dec20-06 01:02 PM
jtbell
7 2,552
I read interesting article regarding Halbach arrays and magnetic levitation (see www.lmco.cn/data/assets/9197.pdf). In...
Aug13-10 07:01 AM
cragar
1 1,571

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