A long solenoid of radius 1 mm has 100 turns per mm . If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid - Physics MCQ NEET 2022 2026 | ExamTest.live

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A long solenoid of radius 1 mm has 100 turns per mm . If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:

Solution & Step-by-step Explanation

Magnetic field at the center of a long solenoid is B = μ_{0} n I .Given: I = 1 A n = 100 turns/mm = 100 \times 1 0^{3} turns/m = 1 0^{5} turns/m μ_{0} = 4 π \times 1 0^{- 7} T m/A $ B = (4 π \times 1 0^{- 7}) \times 1 0^{5} \times 1 $ B = 4 π \times 1 0^{- 2} T B = 4 \times 3.14 \times 1 0^{- 2} = 12.56 \times 1 0^{- 2} T

Try it yourself before checking the explanation above.

A long solenoid of radius 1 mm has 100 turns per mm . If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:

6.28 \times 1 0^{- 2} T

12.56 \times 1 0^{- 2} T

12.26 \times 1 0^{- 4} T

6.28 \times 1 0^{- 4} T

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