Verified Solution • 2025–26 Session moderate

QNEET-2024-Ph-158: NEET 2024 Physics - Class 12 NEET-2024-Ph-158 Solution: The magnetic moment of an iron bar is M. It is now bent in such …

The magnetic moment of an iron bar is M. It is now bent in such a way that it forms an arc section of a circle subtending an angle of 60∘60^\circ at the centre. The magnetic moment of this arc section is 3Mπ\frac{3M}{\pi} 4Mπ\frac{4M}{\pi} Mπ\frac{M}{\pi} 2Mπ\frac{2M}{\pi}

Multiple Choice Options

  • A 3Mπ\frac{3 M}{\pi} � 3 M _
  • B 4Mπ\frac{4 M}{\pi} � 4 M _
  • C Mπ\frac{M}{\pi} � M _
  • D 2Mπ\frac{2 M}{\pi} � 2 M _

Step-by-Step Verified Solution

M = m _ L R _ = L R � 3 = L R = 3 L � M _ = m ( 2 R ) sin _ 30 _ = m ( 2 ) 3 L � _ 1 2 = 3 � m L = 3 M �

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