A wire 2.5 m long is bent into a square. An current of 100 A flowing through the wire will produce a magnetizing force at the center of the square, equal to a.) 72 AT / m. b.) 144 AT / m. c.) 196 AT / m. d.) 222 AT / m.

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answer is B, but how?
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8th year teaching experience in Math and Science

option b) is right answer
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Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

Given data : Wire length ‘L’ = 2.5 m; Current ‘I’ = 100 A; Magnetizing force ‘H’ = ?. In square, length of each side; 2a = L / 4 ? a = 2.5 / 8 = 0.3125 Magnetizing Force H = 144 AT / m
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Don't want to over express myself, just join and feel the experience.

B
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B
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144 AT/m
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Expert mathematician

(I/(4pi)r)*(sin@1+sin@2)=magnetic field (B) 144.05 AT/m
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B
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