A long straight wire carries a current of 40 A in a region where a uniform external magnetic field has a 30-$\mu$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 $\mu$T
B)40 $\mu$T
C)10 $\mu$T
D)50 $\mu$T
E)36$\mu$T

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The Answer of A long straight wire carries a current of 40 A in a region where a uniform external magnetic field has a 30-$\mu$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 $\mu$T
B)40 $\mu$T
C)10 $\mu$T
D)50 $\mu$T
E)36$\mu$T

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