Solenoid Field

Ideal Solenoid: For a long solenoid with closely wound turns, the field inside is strong and uniform, while the field outside is negligible.
Ampere's Law: $\oint B \cdot d l = B L = μ_{0} (N I)$ .
Simplification: Since $n = N / L$ (turns per unit length):
- $B = μ_{0} (N / L) I = μ_{0} n I$ .
Result: The internal field is $B = μ_{0} n I$ , and it points along the axis of the solenoid.

This medium difficulty physics question is from the chapter magnetic effects and magnetism, covering the topic of solenoid field. It appeared in the 2025 exam.

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Solenoid Field

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