Verified Solution • 2025–26 Session moderate

QNEET-2024-Ph-148: NEET 2024 Physics - Class 12 NEET-2024-Ph-148 Solution: The magnetic moment and moment of inertia of a magnetic needle…

The magnetic moment and moment of inertia of a magnetic needle as shown are respectively 1.0×10−2 A m21.0 \times 10^{-2}\ \text{A m}^2 and 10−6π2 kg m2\frac{10^{-6}}{\pi^2}\ \text{kg m}^2. If it completes 10 oscillations in 10 s the magnitude of the magnetic field is 0.4 T 4 T 0.4 mT 4 mT

Multiple Choice Options

  • A 0.4 T
  • B 4 T
  • C 0.4 mT
  • D 4 mT

Step-by-Step Verified Solution

Time period of oscillation of magnet inside the magnetic field T = 2 � I 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

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