In a uniform magnetic field of 0.049 T , a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is 9.8 10 -6 kg m 2 . If the magnitude of magnetic moment of the needle is x 10 -5 Am 2 , then the value of ‘ x ’ is :

1. A. 5 2
2. B. 128 2
3. C. 50 2
4. D. 1280 2

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