A long wire is bent into shape ABCDE as shown in fig. with BCD being a semicircle with centre O and radius r metre. A current of I amp flows through it in the direction A → B →C → D→ E. Then the magnetic induction at the point O of the figure in vacuum is
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A long wire is bent into shape ABCDE as shown in fig. with BCD being a semicircle with centre O and radius r metre. A current of I amp flows through it in the direction A → B →C → D→ E. Then the magnetic induction at the point O of the figure in vacuum is