Linus builds an electrical circuit with a battery and with wires that carry the current. As the battery weakens, the current also weakens. How does this affect the magnetic field around the wires?

A current in a wire creates a magnetic field, and the field’s strength increases with the current. As the battery weakens, the current decreases, so the magnetic field around the wires gets weaker. The field does not necessarily disappear unless the current stops completely.

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