JEE MAIN - Physics (2021 - 27th July Evening Shift - No. 11)
Figure A and B shown to long straight wires of circular cross-section (a and b with a < b), carrying current I which is uniformly distributed across the cross-section. The magnitude of magnetic field B varies with radius r and can be represented as :
_27th_July_Evening_Shift_en_11_1.png)
_27th_July_Evening_Shift_en_11_2.png)
_27th_July_Evening_Shift_en_11_3.png)
_27th_July_Evening_Shift_en_11_4.png)
_27th_July_Evening_Shift_en_11_5.png)
Explanation
Graph for wire of radius R :
_27th_July_Evening_Shift_en_11_6.png)
As b > a
Ba > Bb
$${B_a} = {{{\mu _0}i} \over {2\pi a}}$$
$${B_b} = {{{\mu _0}i} \over {2\pi b}}$$
As b > a
Ba > Bb
$${B_a} = {{{\mu _0}i} \over {2\pi a}}$$
$${B_b} = {{{\mu _0}i} \over {2\pi b}}$$
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