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Question

Magnetic field at point O due to the given structure is
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A
μoI4πR(π2+1)
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B
μoI4πR(π2+1)
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C
μoI2πR(π2+1)
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D
μoI2πR(π2+1)
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Solution

The correct option is A μoI4πR(π2+1)
Direction of Magnetic field can be determined by Right hand screw rule and Finger rule:
BT=BC+Bw1+BW2
BW1=0 at axis
BW2=μoI2πR×12
BC=μoI2R×4
BT=μoI4πR(π2+1)

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