A long straight wire carries a current of 35a in a region


A long straight wire carries a current of 35A in a region where a uniform external magnetic field parallel to the current has a 25μT magnitude. What is the magnitude of the resultant magnetic field at a point that is 25 cm from the wire? 38 μT is the answer not sure how to get this.

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Physics: A long straight wire carries a current of 35a in a region
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