The following applet show interaction force between a circular current loop in magnetic field generated by a magnet.
Red arrow show the direction of the current.
Blue arrow are force \vec{F}=i d\vec{\ell}\times \vec{B} due to current loop in magnetic field generated by a magnet.

You can change the location of magnet with two sliders (move in y/z direction).
The radius R of the current loop can be changed with slider,too.
Click play to trace out the magnetic field lines (produced by magnet).

/htdocs/ntnujava/ejsuser/2/users/ntnu/fkh/magnetNcoil_pkg/magnetNcoil.propertiesFull screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(1501.7kB):double click downloaded file to run it. (32 times by 20 users) , Download EJS source (10 times by 5 users) View EJS source