A magnetic dipole m is moved from inifitley far away to a point on the axis of a fixed, perfectly conducting (zero resistance) circular loop of radius a and self-inductance L. In it's final position the dipole is oriented along the axis of the loop and is a distance z from the centre. If the current in the loop is initially zero:
a) find the current in the loop when the dipole is in its final position.
b) calculate the force between the loop and the dipole in its final position.

Do we just use poyntings theorem somehow to say that the energy that we using to bring the dipole in from infinity

Question

A magnetic dipole m is moved from inifitley far away to a point on the axis of a fixed, perfectly conducting  (zero resistance) circular loop of radius a and self-inductance L. In it's final position the dipole is oriented along the axis of the loop and is a distance z from the centre. If the current in the loop is initially zero:
a) find the current in the loop when the dipole is in its final position.
b) calculate the force between the loop and the dipole in its final position.

Do we just use poyntings theorem somehow to say that the energy that we using to bring the dipole in from infinity

anonymous · Answer

is the energy that gets put into the current?

nikvist · Answer

attachment

anonymous · Answer

Very nice. I'm going to take a break on EM for now and focus on linear algebra II