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A long straight wire, carrying current $I,$ is bent at its midpoint to from an angle of $45^o.$ Induction of magnetic field at point $P,$ distant $R$ from point of bending is equal to :
  • A$\frac{{\left( {\sqrt 2 \, - \,1} \right){\mu _0}I}}{{4\pi R}}$
  • B$\frac{{\left( {\sqrt 2  + 1} \right){\mu _0}I}}{{4\pi R}}$
  • C$\frac{{\left( {\sqrt 2 \, - \,1} \right){\mu _0}I}}{{4\sqrt 2 \pi R}}$
  • D$\frac{{\left( {\sqrt 2 \, + \,1} \right){\mu _0}I}}{{4\sqrt 2 \pi R}}$
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