• # question_answer A current i is flowing in a conductor as shown in the figure. The magnetic induction at point O will be: A)  zero               B)  $l{{\mu }_{0}}i/r$C)  ${{\mu }_{0}}i/4r$                         D)  ${{\mu }_{0}}i/r$

The magnetic induction, ${{B}_{o}}$ (due to only half circle) $=\frac{1}{2}\,\,\frac{{{\mu }_{0}}i}{2r}=\frac{{{\mu }_{0}}i}{4r}$ [as induction (Net), due to straight part will be conceled by each other]