# 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 ...