If a = 2.0 cm, b = 5.0 cm, and I = 20 A, what is the magnitude of the magnetic field at the point P?
A. 4.5 ?T
B. 7.5 ?T
C. 9.0 ?T
D. 6.0 ?T
E. 3.6 ?T
Answer: D
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Fill in the blank(s) with correct word
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