A long straight wire carries a current of 40 A in a region where a uniform external magnetic field has a 30-?T 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 ?T
b. 40 ?T
c. 10 ?T
d. 50 ?T
e. 36 ?T
d
Physics & Space Science
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