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JEE Main Physics Class 12 Moving Charges and Magnetism Part 2 Questions
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© examsnet.com
Question : 41
Total: 100
The magnetic field at the centre of a circular coil of radius
r
, due to current I flowing through it, is
B
. The magnetic field at a point along the axis at a distance
r
2
from the centre is :
[24-Jun-2022-Shift-1]
B
∕
2
2
B
(
2
√
5
)
3
B
(
2
√
3
)
3
B
Validate
Solution:
B
=
µ
0
I
2
r
B
a
=
µ
0
I
r
2
2
(
r
2
+
r
2
4
)
⇒
B
a
B
=
(
2
√
5
)
3
⇒
B
a
=
(
2
√
5
)
3
B
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