Self-inductance of a solenoid, L,

$\overline{){\mathbf{L}}{\mathbf{=}}\frac{{\mathbf{\mu}}_{\mathbf{0}}{\mathbf{N}}^{\mathbf{2}}\mathbf{A}}{\mathbf{l}}}$

**A = πr**^{2}

r = d/2 = (0.150 cm / 2) (1 m / 100 cm) = 7.5 × 10^{-4} m

A metallic laboratory spring is typically 5.00 cm long and 0.150 cm in diameter and has 50 coils.

If you connect such a spring in an electric circuit, how much self-inductance must you include for it if you model it as an ideal solenoid?

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