alleryInside an ideal infinite solenoid with n turns per unit length carrying current I, the magnetic field is
Aμ₀ I n²
Bμ₀ n I, directed along the axis and nearly uniform
Cμ₀ I / (2π r), radial
DZero everywhere inside
Answer & Solution
Correct answer: B. μ₀ n I, directed along the axis and nearly uniform
By Ampere's law on a rectangular loop, B inside a long solenoid is μ₀nI along the axis, nearly uniform. Outside, B ≈ 0.
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