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A wire radius a and b formed a closed circuit with radius a and radius b as shown in the figure. The circuit carries a current I. If the magnetic field is zero at the center point of P (or center of circular curves) then what is the ratio of a/b? (Attention: Be sure to mark the correct answer. If you mark a wrong answer, you will lose 20% of the pt.) a) 4/3 b) 2/3 c) 3/2 d) 7/2 e) 9/2

A wire radius a and b formed a closed circuit with radius a and radius b as shown in the figure. The circuit carries a current I. If the magnetic field is zero at the center point of P (or center of circular curves) then what is the ratio of a/b? (Attention: Be sure to mark the correct answer. If you mark a wrong answer, you will lose 20% of the pt.) a) 4/3 b) 2/3 c) 3/2 d) 7/2 e) 9/2

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A wire radius a and b formed a closed circuit with radius a and radius b as shown in the figure. The circuit carries a current I . If the magnetic field is zero at the center point of P (or center of circular curves) then what is the ratio of a / b ? (Attention: Be sure to mark the correct answer. If you mark a wrong answer, you will lose 20 % of the pt.) a) 4 / 3 b) 2 / 3 c) 3 / 2 d) 7 / 2 e) 9 / 2

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