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  4. The net magnetic flux through any closed surface, kept in a magnetic field is

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Q. The net magnetic flux through any closed surface, kept in a magnetic field is

Electromagnetic Induction

Solution:

According to Gauss's theorem in magnetism, surface integral of magnetic field intensity over a surface (closed or open) is always zero.
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Number of field lines entering and going out from $S$ are equal. So, net flux through $S$ is zero.
$\oint B \cdot d A=0$