Question

37. In Fig. the magnetic needle has magnetic
moment 6.7x10-2 Am? and moment of inertia
I = 7.5x10 kg m². It performs 10 complete
oscillations in 6.70 s. What is the magnitude of the
magnetic field ?
1) 0.2 T
2) 0.05T
3) 0.08 T
4) 0.01T
38. A bar magnet freely suspended in a vibration​

Answer 1

Answer:

option 2 is the correct answer thank you