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A jumper cable is used to start a car that has a dead battery. The cable...

A jumper cable is used to start a car that has a dead battery. The cable barely reaches the car and is outstretched in a straight line. The electric starter motor on the car draws 140 A . What is the magnetic field at a distance of 0.3 m from the cable?

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Answer #1

We know that the magnetic field due to a current carrying straight wire at a distance r is given as follows 27tr We know that

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