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Sol. ℓ = 1 m, r = 0.1 mm = 0.1 */ 10^–3 m R = 100 Ω, f = ? ⇒ R = f ℓ / a ⇒ f = Ra/ℓ = 100 * 3.14 * 0.1 * 0.1 *10^-6/1 = 3.14 * 10^-6 = π * 10^-6 Ω-m.
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