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$20$ $ampere$ current is flowing in a long straight wire. The intensity of magnetic field at a distance $20\, cm$ from the wire will be
  • A$4 \times 10^{-5}\, Wb/m^2$
  • B$9 \times 10^{-5}\, Wb/m^2$
  • C$8 \times 10^{-5}\, Wb/m^2$
  • D$6 \times 10^{-5}\, Wb/m^2$
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