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Jumper cables used to start a stalled vehicle often carry a 15 A current. How strong is the magnetic field 34 cm away? What percentage of the Earth's...

Jumper cables used to start a stalled vehicle often carry a 15 A current. How strong is the magnetic field 34 cm away?
        
What percentage of the Earth's magnetic field (5.00 E-5 T) is this?
        

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