PHYS208 Fundamentals of Physics II

Hint for Ch. 30, 26P

Consider an infinitesimal section of the ribbon of thickness dx located a distance x from the point of evaluation P; the contribution to dB is upwards for each infinitesimal section. Integrate from d to d+w to pick up each contribution dB.

This is a good geometry for checking that the answer reduces to a current line when d becomes large compared to w!


"http://www.physics.udel.edu/~watson/phys208/exercises/hints/30-26P.html"
Last updated March 31, 1998.
Copyright George Watson, Univ. of Delaware, 1997.