A long straight conductor carrying a cur...

A long straight conductor carrying a current `i` is bent to form an almost complete circular loop of radius `r` on it. The magnetic field at the centre of the loop

is directed into the paper

is directed out of the paper

has magnitude `(mu_(0)i)/(2r)(1-1/(pi))`

has magnitude `(mu(0)i)/(2r)(1+1/(pi))`

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B, C

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