In a uniform magnetic field of $0.049\, ext{T}$, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is $9.8 imes 10^{-6}\, ext{kg m}^2$.

Question

In a uniform magnetic field of $0.049\,	ext{T}$, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is $9.8 	imes 10^{-6}\,	ext{kg m}^2$. If the magnitude of magnetic moment of the needle is $x 	imes 10^{-5}\,	ext{A m}^2$, then the value of $x$ is:

Accepted Answer

1280$ \pi^2 $

Answer

50$ \pi^2 $

Answer

5$ \pi^2 $

Answer

128$ \pi^2 $

NEET 2024 Physics Magnetic Oscillations MCQ Question

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