alleryMagnetic field inside a long solenoid (n turns per unit length, current I):
Aμ₀ I
Bμ₀ n I
Cμ₀ I / n
D2 μ₀ n I
Answer & Solution
Correct answer: B. μ₀ n I
**For ideal long solenoid:** B = μ₀ n I (uniform inside, zero outside).
Independent of position.
Used to create uniform magnetic fields in labs.
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