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Class 12 NEET Physics Magnetism and Matter Questions
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© examsnet.com
Question : 3
Total: 50
The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively,
1.0
×
10
−
2
A
m
and
10
−
6
π
2
kg
m
2
. If it completes 10 oscillations in
10
s
, the magnitude of the magnetic field is
[NEET 2024 Re]
0.4
T
4
T
0.4
mT
4
mT
Validate
Solution:
Time period of oscillation of magnet inside the magnetic field
T
=
2
π
√
I
M
B
T
=
t
n
=
10
10
=
1
s
1
=
2
π
√
10
−
6
π
2
×
1.0
×
10
−
2
×
B
1
4
=
10
−
4
B
⇒
B
=
0.4
mT
© examsnet.com
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