All Questions

9 questions
48 views

Reversing magnet polarity to increase/decrease Eddy currents?

I have a cast iron wheel with magnets around the inner radius as a braking mechanism. If I were to add additional magnets around the outer radius, would the amount of Eddy currents increase or crease ...
34 views

Magnetic Dipole from 'Current' in LC Circuit

We can work out the 'current' in an LC (series) circuit by creating and solving an ODE: $$I\frac{1}{LC}+\ddot{I}=0$$ This provides us with a sinusoidal resonant response to any initial current. ...
143 views

Current Loops VS Permanent Magnets

I'm having a hard time understanding the big connection between permanent magnets and current loops. I am aware that they both have the same magnetic field and therefore it can be said that a current ...
830 views

Force/torque on a current loop due to its own magnetic field?

A current loop generates a magnetic field all around itself as shown in picture. My question is: does this magnetic field produce mechanical effects (force or torque) on the loop itself? If so, what ...
442 views

Work on current loop placed in a magnetic field: how can there be work done against magnetic forces? [duplicate]

I'm facing some doubts while studying the lecture on magnetic dipole potential energy http://www.feynmanlectures.caltech.edu/II_15.html - "15–1 The forces on a current loop; energy of a dipole". When ...
1k views

Magnetic dipole moment of toroid

Question: Must every magnetic configuration have a north and south pole? Answer: Not necessarily. True only if the source of the field has a net non-zero magnetic moment. This is not so for a toroid ...
617 views

Magnetic field current loop [duplicate]

Why does a loop of irregular shape carrying current located in a magnetic field change to a circular shape? Will this always happen assuming the wire to be flexible? Even when the force is inwards? ...
I have the following general conceptual concern. Think of a thin conducting loop of radius $R$ placed in the $x$-$y$-plane at $z=0$. There is a homogeneous current density $\vec{j}$ running through ...