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Magnetics question

2023 · 6 Apr · Shift 1 · Q53

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JEE Main
Physics
Magnetics
2023 · 6 Apr · Shift 1 · Q53

Magnetics question

2023 · 6 Apr · Shift 1 · Q53

JEE MainPhysicsMagneticsMCQ+4 / −1

A long straight wire of circular cross-section (radius a) is carrying steady current I. The current I is uniformly distributed across this cross-section. The magnetic field is

A
uniform in the region $r a$
B
zero in the region $r a$
C
directly proportional to $r$ in the region $r a$
D
inversely proportional to $r$ in the region $r a$

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