In a uniform magnetic field of 0.049 T, a magnetic needle performs 20 complete oscillations in 5 s as shown. The moment of inertia of the needle is 
. If the magnitude of magnetic moment of the needle is 
, then the value of x is [NEET 2024]
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Given, magnetic field 
Time period, 
Moment of inertia, 
The time period of oscillation of a magnetic needle in a magnetic field is given by 
where, M is the magnetic moment of the needle.
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