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Two wire loop PQRSP formed by joining tw...

Two wire loop PQRSP formed by joining two semicircular wires of radii `R_(1) and R_(2)` carries a current i as shown in the figure given below. What is the magnetic field induction at the centre O in cases (A) and (B) ?

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The correct Answer is:
`(a) 1.67xx10^(-6)T;` (b) into the page
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