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JEE Mains 6-Apr-2023 Shift 1 Solved Paper
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© examsnet.com
Question : 39
Total: 90
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
[6-Apr-2023 shift 1]
zero in the region
r
<
a
and inversely proportional to
r
in the region
r
>
a
inversely proportional to
r
in the region
r
<
a
and uniform throughout in the region
r
>
a
directly proportional to
r
in the region
r
<
a
and inversely proportional to
r
in the region
r
>
a
uniform in the region
r
<
a
and inversely proportional to distance
r
from the axis, in the region
r
>
a
Validate
Solution:
👈: Video Solution
It is a case of solid infinite current carrying wire.
Using ampere circuital law,
CASE I: if
r
≤
R
B
=
µ
0
i
2
π
R
2
r
CASE II:
r
>
R
B
=
µ
0
i
2
π
r
© examsnet.com
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