The net magnetic flux through any closed surface is

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Question

The net magnetic flux through any closed surface is

Accepted Answer

Correct Answer: A — ZeroStep-by-step Solution:Gauss's law for magnetism: ∮ B·dA = 0This means the net magnetic flux through any closed surface is always zero, regardless of what is enclosed.This is because magnetic monopoles do not exist — every magnetic field line that enters a closed surface must also exit it. There is no source or sink for magnetic flux.Why other options are wrong:B (Positive): Positive net flux would imply a North pole (magnetic monopole) inside — does not exist.C (Infinity): No physical basis.D (Negative): Negative net flux would imply a South pole (magnetic monopole) inside — does not exist.Key Concepts:Gauss's Law for Magnetism: ∮ B·dA = 0 (magnetic flux through any closed surface is zero)Contrasts with Gauss's Law for Electricity: ∮ E·dA = qenc/ε₀ (can be non-zero if charges are enclosed).Magnetic monopoles: Theoretical particles that would be isolated N or S poles — have never been found. Hence, B field lines always form closed loops.

The net magnetic flux through any closed surface is

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