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QAIPM-2011-Ph-1821: NEET 2011 Physics - Class 12 AIPM-2011-Ph-1821 Solution: A short bar magnet of magnetic moment \(0.4\ {J T}^{-1}\) is…

A short bar magnet of magnetic moment 0.4 J T−10.4\ \text{J T}^{-1} is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

Multiple Choice Options

  • A 0.064 J
  • B −0.064-0.064 J
  • C zero
  • D −0.082-0.082 J

Step-by-Step Verified Solution

When a bar magnet of magnetic moment is placed in a uniform magnetic field , its potential energy is U = _ M _ . B _ = M B cos _ _ For stable equilibrium, _ = 0 o U = �MB = � (0.4) (0.16) = � 0.064 J

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