A long straight wire carries a current of 40 a in a region
A long straight wire carries a current of 40 A in a region where a uniform external magnetic field has a 30-µT magnitude and is parallel to the current. What is the magnitude of the resultant magnetic field at a point that is 20 cm from the wire?
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a long straight wire carries a current of 40 a in a region where a uniform external magnetic field has a 30-microt
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