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A wire of resistance 4Ω is used to wind a coil of radius 7cm. The wire has a diameter of  1.4mm  and the specific resistance of its material is 2 × 10−7Ωm. The number of turns in the coil is
  • a)
    50
  • b)
    40
  • c)
    60
  • d)
    70
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A wire of resistance 4Ω is used to wind a coil of radius 7cm. Th...
Let n be the number of turns in the coil. Then total length of wire used,
l = 2πr × n = 2π × 7 × 10−2 × n
Total resistance, R = 
or 4 = 
∴ n = 70
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A wire of resistance 4Ω is used to wind a coil of radius 7cm. Th...
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A wire of resistance 4Ω is used to wind a coil of radius 7cm. The wire has a diameter of 1.4mm and the specific resistance of its material is 2 × 10−7Ωm. The number of turns in the coil isa)50b)40c)60d)70Correct answer is option 'D'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A wire of resistance 4Ω is used to wind a coil of radius 7cm. The wire has a diameter of 1.4mm and the specific resistance of its material is 2 × 10−7Ωm. The number of turns in the coil isa)50b)40c)60d)70Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A wire of resistance 4Ω is used to wind a coil of radius 7cm. The wire has a diameter of 1.4mm and the specific resistance of its material is 2 × 10−7Ωm. The number of turns in the coil isa)50b)40c)60d)70Correct answer is option 'D'. Can you explain this answer?.
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