In the following figure,the magnitude of the magnetic field at the point $P$ is:

  • A
    $\frac{\mu_0 I}{4 \pi r}+\frac{\mu_0 I}{r}$
  • B
    $\frac{\mu_0 I}{4 \pi r}+\frac{\mu_0 I}{4 r}$
  • C
    $\frac{\mu_0 I}{4 \pi r}+\frac{\mu_0 I}{2 r}$
  • D
    $\frac{\mu_0 I}{4 \pi r}-\frac{\mu_0 I}{4 r}$

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