What is the magnitude of magnetic force per unit length on a wire carrying a current of $8\,A$ and making an angle of $30^o$ with the direction of a uniform magnetic field of $0.15\, T$ ?.....$Nm^{-1}$

  • A

    $0.4$

  • B

    $0.6 $

  • C

    $4 $

  • D

    $6$

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