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Question

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 :
330676_d325de7b5f424a4d9611bb546fa2fe97.png
  1. μ0Iπ4πR1
  2. μ0Iπ4πR2
  3. μ0Iπ4π(1R11R2)
  4. μ0Iπ4π(1R1+1R2)

A
μ0Iπ4πR2
B
μ0Iπ4π(1R1+1R2)
C
μ0Iπ4πR1
D
μ0Iπ4π(1R11R2)
Solution
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Answer is D.

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