Magnetic dipole Definition and 115 Threads

This isn't a homework problem, I'm just doing this as practice. Homework Statement A magnetic dipole is oriented in a loop of wire of N turns and radius a so that the dipole vector is parallel to the normal of the loop. The loop is connected to a galvanometer, and the active resistance of...

this is not homework help.I want to know. Hello,can anyone suggest why for a dipole m placed in a magnetic field B F=grad(m.B) and N=mxB?

Homework Statement 1) In the case of a bar magnet, outside it, the magnetic lines of forces start from North Pole and end on South Pole. But inside it, the lines of force start from south and end on North Pole. According to definition of direction of lines of force, it is the direction in...

Homework Statement Find the magnetic dipole moment of a spherical shell of radiu R carrying a uniform surface charge sigma, set spinning at angular velocity omega. Homework Equations \vec{m} = \frac{1}{2} \int_{S} \vec{r'} \times \vec{K} (\vec{r'}) da' The Attempt at a Solution So...

Homework Statement A phonograph record of radius R carrying a unifrom surface charge sigma is rotating at a cosntant angular velocity omega. Find its magnetic dipole momentHomework Equations m = int I \bullet da The Attempt at a Solution Need to find the current first well the sruface charge...

Hi; Can somebody solve this question below? (i found some answers but I'm not sure of them) TY for your interesting..

For a current loop, the magnetic dipole moment is defined as i \int d\vec{a} Now, if I'm given a surface current 'K', how can I find the magnetic dipole moment? For example, if a disc of surface charge [itex] \sigma [/tex] is rotating with angular velocity [itex] \omega [/tex], what is it's...

Take the example of a magnetic dipole in a magnetic field. The dipole will experience a torque that will tend to align its magnetic moment with the field lines of the magnet. So why on Earth is there no mention made of this torque in any of the countless descriptions of the Stern Gerlach...

I have some trouble with this electromagnetism problem: I need to transform the four-potential of a magnetic dipole at rest, in order to obtain it's value in a reference frame (I understand it's the Lab frame) where we see the dipole moving at v. I know what the magnetic vector potential is...

Hello, i have absolutely no clue on how to start this one: a sphere of radius R has a uniform volume charge density \rho. Determine the magnetic dipole moment of the sphere when it rotates as a rigid body with angular velocity \omega about an axis through its center. thanks for the help...

Magnetic Dipole Moment does not include the permeability of free space? Hi, The formula for a magnetic field in a current loop involves the permeability of free space. But the formula for the magnetic dipole moment which seems to represent the flux through a current loop does not...

For an undergraduate electrodynamics homework problem we were asked to derive the following: (griffiths 6.21) show that the energy of a magnetic dipole in a magnetic field B is given by - U = -m.B where B is the magnetic field and m is the dipole moment. I went about this...

Hi All, Please show me the derivation of the vector potentiol A for the magnetic dipole. from equation 8.21 to 8.21a This page is taken from Sadikus book. ** i tried all day and couldn't manage to obtain it. i need the derivation step by step ** thanks newbie...

i received this problem from my lecturer A solenoid is wound with 2200 turns per meter, and carries a current 2.5A. Take the axis of the solenoid to the solenoid to be parallel to the z-axis. A magnetic dipole moment given (m)=(20A.m^2)i+ (30A.m^2)k is located inside the solenoid. i)how...

I need to find the field of a magnetic dipole embedded in the center of a linear magnetic sphere of radius R. My idea was that the field would be identical to that of a superposition of a dipole in a linear magnetic material throughout space and a surface current on the sphere equal to the...