The correct expression in accordance with Gauss's law for magnetism is

Option 1 - <p><span class="mathml" contenteditable="false"> <math> <mo>∮</mo> <mrow> <mrow> <mover accent="true"> <mrow> <mrow> <mi>E</mi> </mrow> </mrow> <mo>⃗</mo> </mover> <mo>.</mo> <mi>d</mi> <mi>s</mi> <mo>=</mo> <mfrac> <mrow> <mrow> <msub> <mrow> <mrow> <mi>q</mi> </mrow> </mrow> <mrow> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </mrow> </msub> </mrow> </mrow> <mrow> <mrow> <msub> <mrow> <mrow> <mi>ε</mi> </mrow> </mrow> <mrow> <mrow> <mn>0</mn> </mrow> </mrow> </msub> </mrow> </mrow> </mfrac> </mrow> </mrow> </math> </span></p>
Option 2 - <p><span class="mathml" contenteditable="false"> <math> <mo>∮</mo> <mrow> <mrow> <mover accent="true"> <mrow> <mrow> <mi>B</mi> </mrow> </mrow> <mo>⃗</mo> </mover> <mo>.</mo> <mi>d</mi> <mi>s</mi> <mo>=</mo> <mn>0</mn> </mrow> </mrow> </math> </span></p>
Option 3 - <p><span class="mathml" contenteditable="false"> <math> <mo>∮</mo> <mrow> <mrow> <mi>E</mi> <mo>.</mo> <mi>d</mi> <mi>l</mi> <mo>=</mo> <mfrac> <mrow> <mrow> <mo>-</mo> <mi>d</mi> <msub> <mrow> <mrow> <mi mathvariant="normal">Φ</mi> </mrow> </mrow> <mrow> <mrow> <mi mathvariant="normal">B</mi> </mrow> </mrow> </msub> </mrow> </mrow> <mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mrow> </mfrac> </mrow> </mrow> </math> </span></p>
Option 4 - <p><span class="mathml" contenteditable="false"> <math> <mo>∮</mo> <mrow> <mrow> <mover accent="true"> <mrow> <mrow> <mi>E</mi> </mrow> </mrow> <mo>⃗</mo> </mover> <mo>.</mo> <mi>d</mi> <mi>l</mi> <mo>=</mo> <mfrac> <mrow> <mrow> <msub> <mrow> <mrow> <mi>q</mi> </mrow> </mrow> <mrow> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </mrow> </msub> </mrow> </mrow> <mrow> <mrow> <msub> <mrow> <mrow> <mi>ε</mi> </mrow> </mrow> <mrow> <mrow> <mn>0</mn> </mrow> </mrow> </msub> </mrow> </mrow> </mfrac> </mrow> </mrow> </math> </span></p>
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4 months ago
Correct Option - 2
Detailed Solution:

According to Gauss's law magnetism

? B ? . d s ? = 0

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Physics Magnetism and Matter 2025

Physics Magnetism and Matter 2025

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