A long straight wire of circular cross section of radius a carries a steady current I……………………

Class 12th Physics, Question -A long straight wire of circular cross section of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnitudes of magnetic field at a point distant a/2 above the surface of wire to that at a point distant a/2 below its surface is

By
Komal Kohli
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These are the options for the question :A long straight wire of circular cross section of radius a carries a steady current I. The current is uniformly distributed across its
cross section. The ratio of the magnitudes of magnetic field at a point distant a/2 above the surface of wire to that at a point distant a/2 below its surface is

(i) 4 :1
(ii) 1:1
(iii) 4: 3
(iv) 3 :4

The correct answer is -(iii) 4:3

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