A long solenoid has 2000 turns per metre and carries a current of 2.0 A. Take μ₀ = 4π × 10⁻⁷ T m A⁻¹. What is the magnetic flux density inside it?
Correct answer D. 5.0 × 10⁻³ T
Explanation
B = μ₀nI = 4π × 10⁻⁷ × 2000 × 2.0 = 5.03 × 10⁻³ T ≈ 5.0 × 10⁻³ T. Forgetting the factor of the current gives 2.5 × 10⁻³ T.
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