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Magnetics question

2024 · 8 Apr · Shift 2 · Q61

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Magnetics
2024 · 8 Apr · Shift 2 · Q61

Magnetics question

2024 · 8 Apr · Shift 2 · Q61

JEE MainPhysicsMagneticsMCQ+4 / −1

A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic field at

\frac{a}{2}

and

2 a

from axis of the wire is :

A
$4: 1$
B
$3: 4$
C
$1: 1$
D
$1: 4$

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