If the current in a long straight wire doubles, what happens to the magnetic field at a fixed distance?

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Multiple Choice

If the current in a long straight wire doubles, what happens to the magnetic field at a fixed distance?

Explanation:
The magnetic field around a long straight wire grows directly with the current. At a fixed distance from the wire, the distance is constant, so the field strength scales with the current: B = μ0 I /(2π r). Since μ0 and r are fixed, doubling the current makes the magnetic field magnitude double as well.

The magnetic field around a long straight wire grows directly with the current. At a fixed distance from the wire, the distance is constant, so the field strength scales with the current: B = μ0 I /(2π r). Since μ0 and r are fixed, doubling the current makes the magnetic field magnitude double as well.

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