A long slender solenoid has tightly spaced turns wound in a single layer over its surface. The winding wire has a thickness = 0.1 mm. If a current of 1A flows through the winding wire, what is the approximate value of magnetic field at the mid plane of the solenoid winding, on its axis ?
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Question

A long slender solenoid has tightly spaced turns wound in a single layer over its surface. The winding wire has a thickness = 0.1 mm. If a current of 1A flows through the winding wire, what is the approximate value of magnetic field at the mid plane of the solenoid winding, on its axis ?

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G1 Physics · Accepted Answer

Turn spacing equals wire thickness 0.1 mm, so n=10⁴ m⁻¹. Long-solenoid field B=μ₀nI=4π×10⁻⁷×10⁴=4π×10⁻³ T. Hence D.