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Magnetic field due to semi infinite length wire at point $P$ 
  • A${B_p} = \frac{{{\mu _0}I}}{{4\pi d}}[\sin \,\theta  + 1]$
  • B${B_p} = \frac{{{\mu _0}d}}{{4\pi I}}[\sin \,\theta ]$
  • C${B_p} = \frac{{{\mu _0}I}}{{4\pi d}}[\sin \,\theta  + \sin \,\theta ]$
  • D${B_p} = \frac{{{\mu _0}I}}{{4\pi d}}[\sin \,90 + \sin \,90]$
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