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Magnetics question

2022 · 25 Jun · Shift 1 · Q53

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JEE Main
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Magnetics
2022 · 25 Jun · Shift 1 · Q53

Magnetics question

2022 · 25 Jun · Shift 1 · Q53

JEE MainPhysicsMagneticsMCQ+4 / −1

A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r < R) from its centre will be :

A
B $\propto$ r2
B
B $\propto$ r
C
B $\propto{1 \over {{r^2}}}$
D
B $\propto{1 \over {{r}}}$

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