A wire loop formed by joining two semi-circular wires of radii R1 and R2 carries a current as shown in the adjoining diagram. The magnetic induction at the centre O is :
μ0Iπ4πR1
μ0Iπ4πR2
μ0Iπ4π(1R1−1R2)
μ0Iπ4π(1R1+1R2)
A
μ0Iπ4πR2
B
μ0Iπ4π(1R1+1R2)
C
μ0Iπ4πR1
D
μ0Iπ4π(1R1−1R2)
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Solution
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Answer is D.
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