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Class 12 NEET Physics Magnetism and Matter Questions
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© examsnet.com
Question : 13
Total: 50
A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of,
(i) an equilateral triangle of side 'a'.
(ii) a square of side 'a'.
The magnetic dipole moments of the coil in each case respectively are
[NEET 2021]
3 Ia
2
and 3 Ia
2
3 Ia
2
and Ia
2
3 Ia
2
and 4 Ia
2
4 Ia
2
and 3 Ia
2
Validate
Solution:
👈: Video Solution
Current in the loop will be
V
R
=
l
which is same for both loops.
Now magnetic moment of Triangle loop
=
NIA
M
1
=
(
12
a
3
a
)
.
l
.
√
3
4
a
2
=
√
3
∕
a
2
and magnetic moment of square loop
=
N
′
I
A
′
=
(
12
a
4
a
)
.
l
.
a
2
M
2
=
3
l
a
2
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