Chapter 29, Problem 003 At a certain location, Earth's magnetic field of 37 µT is horizontal...
Chapter 29, Problem 003 At a certain location, Earth's magnetic field of 37 µT is horizontal and directed due north. Suppose the net field is zero exactly 10 cm above a long, straight, horizontal wire that carries a constant current. What are (a) the magnitude of the current and (b) the angle between the current direction and due north?
Homework Answers
A)
Magnetic field, B = u0 I/2 pi r
37 x 10^-6 = (2 x 10^-7) x I/0.10
Current, I = 18.5 A
B)
90 degree
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