A Long Straight Wire Carries a Current of 40 a in a Region

question 84

Multiple Choice

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?

• A) 70 μT
• B) 40 μT
• C) 10 μT
• D) 50 μT
• E) 36 μT

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