An infinitely long hollow conducting cylinder with radius R carries a uniform current along its surface.

Choose the correct representation of magnetic field (B) as a function of radial distance (r) from the axis of cylinder.

 

<p>Using Ampere’s law for long hollow cylinder carrying current on its surface</p><p>B_in = 0</p><p><span class="mathml" contenteditable="false"> <math> <mrow> <msub> <mrow> <mi>B</mi> </mrow> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mrow> <mi>μ</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msub> <mi>i</mi> </mrow> <mrow> <mn>2</mn> <mi>π</mi> <mi>r</mi> </mrow> </mfrac> </mrow> </math> </span>&nbsp;</p><p><strong>&nbsp;</strong></p>

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