Question
The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, 1.0 10^ -2 ~A ~m and 10^ -6 ^2 ~kg ~m ^2. If it completes 10 oscillations in 10 s , the magnitude of the magnetic field is
NEET
Physics
Magnetic Properties of Matter
2024
NEET 2024 (Re-NEET)
NEET Physics Question (2024) — Solution
Options
- A. 0.4 T
- B. 4 T
- C. 0.4 mT
- D. 4 mT
Answer
C. 0.4 mT
Step-by-step solution
Time period of oscillation of magnet inside the magnetic field T=2 1 M B T= t n = 10 10 =1 ~s 1=2 10^ -6 ^2 1.0 10^ -2 B 1 4 = 10^ -4 B B=0.4 mT
Related: Physics — Magnetic Properties of Matter · All PYQ Banks