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Using a simple model of an electromagnet, describe the factors that increase the magnetic field strength of an electromagnet.(2 points)
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Use the solenoid model: B ≈ μ (N/L) I (magnetic field ∝ permeability × ampere‑turns per length).
Two factors that increase the field:
1. Increase the ampere‑turns per length (N I / L) — raise the current I, add more turns N, or make the coil shorter so turn density increases.
2. Increase the magnetic permeability μ — insert a high‑μ ferromagnetic core (soft iron) and minimize air gaps in the magnetic circuit.
Two factors that increase the field:
1. Increase the ampere‑turns per length (N I / L) — raise the current I, add more turns N, or make the coil shorter so turn density increases.
2. Increase the magnetic permeability μ — insert a high‑μ ferromagnetic core (soft iron) and minimize air gaps in the magnetic circuit.
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