A coaxial cable consists of an inner wire of radius 'a' surrounded by an outer shell of inner and outer radii 'b' and 'c' respectively. The inner wire carries an electric current <img alt="" class="docx-inline-img" src="/media/question_bank_word_uploads/eb9a3ff95a9745338a124390cba9260b/b790e72c307245b39b2dbd4da9d2de05.png" style="max-width:100%!important;height:auto!important;vertical-align:middle;display:inline-block;margin:3px 4px;padding:0;border:0;background:transparent;box-shadow:none;filter:none;opacity:1;mix-blend-mode:normal;object-fit:contain;image-rendering:auto;max-width:100%!important;height:auto!important;vertical-align:middle;display:inline-block;margin:3px 4px;padding:0;border:0;object-fit:contain;image-rendering:auto;width:12.07px!important;max-width:100%!important;height:auto!important;vertical-align:middle;display:inline-block;margin:3px 4px;padding:0;border:0;object-fit:contain;image-rendering:auto;margin-left: 0.00px; margin-top: 0.00px; -webkit-"/> , which is distributed uniformly across crosssectional area. The outer shell carries an equal current in opposite direction and distributed uniformly. What will be the ratio of the magnetic field at a distance from the axis when (i) x < a and (ii) a < x < b?

The correct answer is A. when x < a When a < x < b

<p>A coaxial cable consists of an inner wire of radius 'a' …

Physics Magnetism and Matter JEE Main 2021 - ( Magnetic Effects of Current ) MCQ (Single Correct)

A coaxial cable consists of an inner wire of radius 'a' surrounded by an outer shell of inner and outer radii 'b' and 'c' respectively. The inner wire carries an electric current , which is distributed uniformly across crosssectional area. The outer shell carries an equal current in opposite direction and distributed uniformly. What will be the ratio of the magnetic field at a distance from the axis when (i) x < a and (ii) a < x < b?