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The magnetic induction at the centre $O$ of the current carrying bent wire shown in the adjoining figure is
  • A$\frac{{{\mu _0}I}}{{4\pi {R_1}}}\alpha $
  • B$\frac{{{\mu _0}I}}{{4\pi {R_2}}}\alpha $
  • C$\frac{{{\mu _0}I\alpha }}{{4\pi }}\left( {\frac{1}{{{R_1}}} - \frac{1}{{{R_2}}}} \right)$
  • D$\frac{{{\mu _0}I\alpha }}{{4\pi }}\left( {\frac{1}{{{R_1}}} + \frac{1}{{{R_2}}}} \right)$
Medium
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