BField Physlet v4.0  allows users to simulate the magnetic fields produced by long straight wires or by circular loops.  In addition, an external field may be plotted by specifying Bx and Bx.

Refer to the script examples to see how this applet can be used to create interactive physics problems.


Due to the different geometries involved in the calculations, BField simulates either long straight wires or loops, but not both.

Forces between loops are not calculated.

Due to numerical errors, field lines may cross and give other non-physical behavior if the curvature of the field is too great.  This occurs most often when field lines are plotted close to wires.