Concept explainers
(I) Jumper cables used to start a stalled vehicle often carry a 65-A current. How strong is the magnetic field 3.5 cm from one cable? Compare to the Earth’s magnetic field (5.0 × 10-5 T).
We assume the jumper cable is a long straight wire, and use Eq. 28-1.
Compare this to the Earth’s field of 0.5 × 10-4 T.
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