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KEAM 2017 Physics and Chemistry Paper
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© examsnet.com
Question : 22
Total: 120
A long straight wire of radius R carries a steady current,
I
o
, uniformly distributed throughout the cross-section of the wire. The magnetic field at a radial distance r from the centre of the wire, in the region r > R, is
µ
o
I
o
2
π
r
µ
o
I
o
2
π
R
µ
o
I
o
R
2
2
π
r
µ
o
I
o
r
2
2
π
r
µ
o
I
o
r
2
2
π
R
2
Validate
Solution:
Radius of wire
=
R
Steady current passing through the wire
=
I
0
The magnetic field at radial distance
r
from the centre of the wire
∮
B
.
d
l
=
µ
0
i
⇒
B
∫
d
l
=
µ
0
I
0
⇒
B
=
µ
0
I
0
2
π
r
© examsnet.com
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