This following applet is [b]twolinesBfield[/b]
Created by prof Hwang Modified by Ahmed
Original project [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1451]twolinesBfield[/url]

There is current flow I in the z direction (along z-axis) which will produce circular magnet field.

There is another current i along x direction initially (i<<I), the direction of thos current can be adjusted with slider.

The magnet force between current segment, i d\vec{\ell} in magnetic field \vec{B}=\frac{\mu_o I}{2\pi r}\hat{\theta} is d\vec{F}=i d \vec{\ell}\times \vec{B}

The direction of current is represented with red arrow. Gray arrows are magnetic field, Blue arrows are interaction force.

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