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www.GOALias.blogspot.comMagnetism andMatterFIGURE 5.7Solution(a) Wrong. Magnetic field lines can never emanate from a point, asshown in figure. Over any closed surface, the net flux of B mustalways be zero, i.e., pictorially as many field lines should seem toenter the surface as the number of lines leaving it. The field linesshown, in fact, represent electric field of a long positively chargedwire. The correct magnetic field lines are circling the straightconductor, as described in Chapter 4.EXAMPLE 5.6183