Verified Solution • 2025–26 Session moderate

QJEEM19Ph6785: JEE Main 2019 Physics - Class 12 JEEM19Ph6785 Solution: A hoop and a solid cylinder of same mass and radius are made of …

A hoop and a solid cylinder of same mass and radius are made of a permanent magnetic material with their magnetic moment parallel to their respective axes. But the magnetic moment of hoop is twice of solid cylinder. They are placed in a uniform magnetic field in such a manner that their magnetic moments make a small angle with the field. If the oscillation periods of hoop and cylinder are Th and Tc respectively, then -

Multiple Choice Options

  • A Th = 1.5 Tc
  • B Th = Tc
  • C Th = 2Tc
  • D Th = 0.5 Tc

Step-by-Step Verified Solution

T = 2π1μB

Th = 2πmR2(2μ)B

TC = 2π1/2mR2μB

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