A 1 Tesla magnetic field near Earth could have severe consequences, disrupting the Van Allen belts and potentially destroying satellite electronics due to increased radiation. The field could create bright auroras and interfere with RF communication by generating cyclotron radiation. Power lines would vibrate at 60 Hz, producing loud humming sounds, while transformers with ferromagnetic cores would become ineffective due to saturation. Loose ferromagnetic materials would pose hazards, and everyday items like shoelaces could be affected. Overall, such a magnetic field could lead to significant disruptions in modern civilization.