Problem 28.10

Please wait for the animation to completely load.

The animation shows the cross section of a loop of wire oriented perpendicular to the screen.  It carries a current into and out of the screen (position is given in millimeters and magnetic field is given in millitesla).  You can move the loop (drag at the middle) or change its radius (drag either the red or blue dot).   Restart. 

1. What is the current in the loop?
2. Develop an expression for the magnetic field in the center of the loop as a function of the radius of the loop.  Verify your expression with the animation.

Problem authored by Mario Belloni and modified by Anne J. Cox.
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