Created by StemPy LabThe current in a long straight wire is made times as large, and you move to twice the distance from it. What happens to the field you measure?
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← The Earth's field at a place is about 50 µT. A long wire there carries 7.5 A. At what distance is the wire's own field as strong as the Earth's? Take µ₀ = 4π × 10⁻⁷ T m/A.A solenoid of 600 turns is 0.3 m long and carries 1.5 A. What is the field inside it? Use B = µ₀ n I with µ₀ = 4π × 10⁻⁷ T m/A. →
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