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NEET PHYSICSEasy

The net magnetic flux through any closed surface is:

A

negative

B

zero

C

positive

D

infinity

Step-by-Step Solution

  1. Gauss's Law for Magnetism: This law states that the net magnetic flux (ΦBΦ_B) through any closed surface is always zero. ∮B⋅dA=0\oint \mathbf{B} \cdot d\mathbf{A} = 0
  2. Physical Reasoning: Unlike electric charges (monopoles) which can exist in isolation (allowing for positive or negative flux), magnetic monopoles do not exist. Magnetic field lines are continuous closed loops. Therefore, the number of magnetic field lines entering any closed surface must exactly equal the number of lines leaving it, resulting in a net flux of zero.
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