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A circular coil of 70 turns and radius 5 cm carrying a current of 8 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.5 T. The field lines make an angle of 30o with the normal of the coil then the magnitude of the counter torque that must be applied to prevent the coil from turning is
  • a)
    33 Nm
  • b)
    3.3 Nm
  • c)
    3.3×10−2Nm
  • d)
    3.3×10−4Nm
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A circular coil of 70 turns and radius 5 cm carrying a current of 8 A ...
N = 70, r = 5cm = 5 × 10−2m,I = 8A 
B = 1.5T, θ = 30
The counter torque to prevent the coil from turning will be equal and opposite to the torque acting on the coil,
∴ τ = NIABsinθ = NIπr2Bsin30 
= 70 × 8 × 3.14 × (5 × 10−2)2 × 1.5 × 1/2
= 3.297 N m
≈ 3.3 N m
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A circular coil of 70 turns and radius 5 cm carrying a current of 8 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.5 T. The field lines make an angle of 30o with the normal of the coil then the magnitude of the counter torque that must be applied to prevent the coil from turning isa)33 Nmb)3.3 Nmc)3.3×10−2Nmd)3.3×10−4NmCorrect answer is option 'B'. Can you explain this answer?
Question Description
A circular coil of 70 turns and radius 5 cm carrying a current of 8 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.5 T. The field lines make an angle of 30o with the normal of the coil then the magnitude of the counter torque that must be applied to prevent the coil from turning isa)33 Nmb)3.3 Nmc)3.3×10−2Nmd)3.3×10−4NmCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A circular coil of 70 turns and radius 5 cm carrying a current of 8 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.5 T. The field lines make an angle of 30o with the normal of the coil then the magnitude of the counter torque that must be applied to prevent the coil from turning isa)33 Nmb)3.3 Nmc)3.3×10−2Nmd)3.3×10−4NmCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A circular coil of 70 turns and radius 5 cm carrying a current of 8 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.5 T. The field lines make an angle of 30o with the normal of the coil then the magnitude of the counter torque that must be applied to prevent the coil from turning isa)33 Nmb)3.3 Nmc)3.3×10−2Nmd)3.3×10−4NmCorrect answer is option 'B'. Can you explain this answer?.
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