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NEET 2022
Exam
NEET
Year
2022
Subject
Physics
Chapter
Magnetic Effects of Current

NEET 2022 · Physics · Magnetic Effects of Current

A long solenoid of radius 1mm has 100turns per mm . If 1A current...

A long solenoid of radius 1mm1mm has 100turns100turns per mmmm. If 1A1A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:

Options

  1. A12.56×10−2T12 . 56 \times {10}^{- 2}T
  2. B12.56×10−4T12 . 56 \times {10}^{- 4}T
  3. C6.28×10−4T6 . 28 \times {10}^{- 4}T
  4. D6.28×10−2T6 . 28 \times {10}^{- 2}T

Correct answer

A. 12.56×10−2T12 . 56 \times {10}^{- 2}T

Step-by-step solution

Radius =1mm= 1mm

N=100turnsN = 100turns per mmmm

Current =1A= 1A

Magnetic field strength at the centre of the solenoid is,

B=μ0ni=4π×10−7×100×103×1⇒B=12.56×10−2TB = {\mu}_{0}ni = 4\pi \times {10}^{- 7} \times 100 \times {10}^{3} \times 1 ⇒ B = 12 . 56 \times {10}^{- 2}T

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