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Unformatted text preview: 1. (a) Since the ﬁeld lines of a bar magnet point towards its South pole, then the B arrows in one’s sketch
should point generally towards the left and also towards the central axis.
(b) The sign of B · dA for every dA on the side of the paper cylinder is negative.
(c) No, because Gauss’ law for magnetism applies to an enclosed surface only. In fact, if we include
the top and bottom of the cylinder to form an enclosed surface S then s B · dA = 0 will be valid,
as the ﬂux through the open end of the cylinder near the magnet is positive. ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
- Fall '08