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PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Solenoids

Field inside a long coil

An air-cored long solenoid has 1000 turns per metre and carries 2 A.

Find the interior magnetic-field magnitude.

Organize the givens & assumptions
  • n = 1000 m⁻¹
  • I = 2 A

Long ideal air-cored solenoid; observation well away from ends; n is turns per metre; μ₀ = 4π × 10⁻⁷ H/m.

  1. A4π×10−4 T4\pi\times10^{-4}\ \mathrm T
  2. B8π×10−7 T8\pi\times10^{-7}\ \mathrm T
  3. C8π×10−3 T8\pi\times10^{-3}\ \mathrm T
  4. D8π×10−4 T8\pi\times10^{-4}\ \mathrm T

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