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Question

In the figure shown there are two semicircles of radii r1 and r2 in which a current I is flowing. The magnetic induction at the centre O will be:


A
μ0ir1(r1+r2)
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B
μ0i4(r1r2)
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C
μ0i4(r1+r2r1r2)
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D
μ0i4(r2r1r1r2)
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