the magnetic induction at $O$ due to the whole length of the conductor is
A$\frac{{{\mu _0}i}}{r}$
B$\frac{{{\mu _0}i}}{{2r}}$
C$\frac{{{\mu _0}i}}{{4r}}$
D
Zero
Medium
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C$\frac{{{\mu _0}i}}{{4r}}$
c (c) The induction due to $AB$ and $CD$ will be zero. Hence the whole induction will be due to the semicircular part $BC$. $B = \frac{{{\mu _o}i}}{{4r}}$
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