Find the magnetic induction at point O, ...

Find the magnetic induction at point O, if the current carrying wire is in the shape shown in the figure.

`(mu_(0)l)/(5pi r)[(3pi)/(2)+1]o.`

`(mu_(0)l)/(3pi r)[(3pi)/(4)+1]o.`

`(mu_(0)l)/(2pir)[(3pi)/(4)+1]o.`

`(mu_(0)l)/(4pir)[(3pi)/(2)+1]o.`

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