Solenoid Field
Mediumphysics
Magnetic field inside long solenoid (turns per length n, current I) approximately?
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Solution
Incorrect! Answer:
μ0 n I
- 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: ∮B⋅dl=BL=μ0(NI).
- Simplification: Since n=N/L (turns per unit length):
- B=μ0(N/L)I=μ0nI.
- Result: The internal field is B=μ0nI, and it points along the axis of the solenoid.
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About This Question
- Subject
- physics
- Chapter
- magnetic effects and magnetism
- Topic
- solenoid field
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
μ0 n I
- 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: ∮B⋅dl=BL=μ0(NI).
- Simplification: Since n=N/L (turns per unit length):
- B=μ0(N/L)I=μ0nI.
- Result: The internal field is B=μ0nI, 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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