Verified Solution • 2025–26 Session moderate

QJEEM23Ph3ae8: JEE Main 2023 Physics - Class 12 JEEM23Ph3ae8 Solution: A square loop of area 25 cm 2 has a resistance of 10 Ω . The…

A square loop of area 25 cm2 has a resistance of 10 Ω. The loop is placed in uniform magnetic field of magnitude 40.0 T. The plane of loop is perpendicular to the magnetic field. The work done in pulling the loop out of the magnetic field slowly and uniformly in 1.0 sec, will be

Multiple Choice Options

  • A 1.0×10−3 J
  • B 5×10−3 J
  • C 2.5×10−3 J
  • D 1.0×10−4 J

Step-by-Step Verified Solution

From energy conservation

Work done to pull the loop out = Energy is lost in the resistance

Emf in the loop =dϕdt=B×At=40×25×10−41s=0.1V

Energy lost =emf2R=(0.1)210=10−3J

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