PHYS208 Fundamentals of Physics II

Answer for Ch. 30, 45P

If l is the length of the left side of the amperian loop, then the line integral is Bl. Since neither B nor l is zero, Ampere's law would apparently be violated since no current is enclosed by the loop. Thus the sketch of the magnetic field lines must be in error. The lines actually bulge outward and their density decreases gradually, not abruptly as shown.

Last updated Oct. 29, 1997.
Copyright George Watson, Univ. of Delaware, 1997.