Magnetic Field of a Long Wire: At point P the magnetic field due to a long straight wire carrying a current of 2.0 A is 1.2 µT. How far is P from the wire? (?0 = 4? × 10-7 T ? m/A)
A. 11 cm
B. 22 cm
C. 33 cm
D. 44 cm
E. 55 cm
Answer: C
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