What is the average magnetic dipole moment?


by c.adhityaa
Tags: dipole moment, induction, magnetics, magnets, voltage
c.adhityaa
c.adhityaa is offline
#1
Sep19-11, 09:45 AM
P: 2
Though this might be absurd, I would seriously like to know the average magnetic dipole of a magnet. For example, you might consider a regular magnet in a remote control car's motors, or any other suggestions too. And I have one more doubt- I know that e.m.f=-d(phi)/dt and phi=integral(B.dS). So, could we use e.m.f=-S.(dB/dt)???

Thank you,
Adhityaa
Phys.Org News Partner Physics news on Phys.org
Information storage for the next generation of plastic computers
Scientists capture ultrafast snapshots of light-driven superconductivity
Progress in the fight against quantum dissipation
Vanadium 50
Vanadium 50 is offline
#2
Sep19-11, 09:57 AM
Mentor
Vanadium 50's Avatar
P: 15,570
How long is a piece of string?
c.adhityaa
c.adhityaa is offline
#3
Sep24-11, 01:28 AM
P: 2
length of a string ??? I don't get you... Could you please explain ????

BruceW
BruceW is offline
#4
Sep24-11, 09:33 AM
HW Helper
BruceW's Avatar
P: 3,337

What is the average magnetic dipole moment?


A magnet generally creates a complicated magnetic field. But usually, we approximate that the magnetic field is a dipole field in the approximation of large distances from the magnet. In other words, this equation won't work close to the magnet, but it is a useful approximation when not close to the magnet:
[tex]B=\frac{\mu_0}{4 \pi} \frac{m}{r^3} \sqrt{1 + 3 sin^2(\frac{\pi}{2} - \theta)}[/tex]
Where [itex]\theta[/itex] is the angle from the dipole axis. And m is the dipole moment.

So this equation would give you the magnetic moment if you could measure the magnetic field of the magnet.

I'm not sure what you mean by the average magnetic dipole?... Surely it is only one value which depends on the type of magnet.
jtbell
jtbell is offline
#5
Sep24-11, 10:03 AM
Mentor
jtbell's Avatar
P: 11,222
Quote Quote by c.adhityaa View Post
length of a string ??? I don't get you...
He's indirectly telling you (by asking a similar sort of question) that your question is unanswerable without further information.


Register to reply

Related Discussions
Magnetic Field of Magnetic Dipole Moment Classical Physics 8
Magnetic Dipole Moment Advanced Physics Homework 2
why is the electric dipole moment of an atom zero, but the magnetic moment nonzero? Quantum Physics 9
average effective dipole moment? Introductory Physics Homework 5
Magnetic Dipole moment Advanced Physics Homework 2