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  4. A closed surface S encloses a magnet of magnetic moment 2 ml . The magnetic flux emerging from the surface is

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Q. A closed surface $ S $ encloses a magnet of magnetic moment $ 2 \,ml $ . The magnetic flux emerging from the surface is

UPSEEUPSEE 2011Magnetism and Matter

Solution:

According to Gauss's law in magnetism, net magnetic flux through any closed surface is always zero, ie,
$\oint B \cdot d s =0$