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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    If the scalar and vector products of two vectors X and S are equal in magnitude, then the angle between the two vectors is

    A)  \[{{45}^{o}}\]           

    B)  \[{{90}^{o}}\]

    C)  \[{{180}^{o}}\]          

    D)  \[{{360}^{o}}\]

    Correct Answer: A

    Solution :

    According to problem, \[|(\vec{A}.\vec{B})|=|\vec{A}\times \vec{B}|\] or \[AB\,\,\cos \,\theta \,\,=AB\,\,\sin \,\,\theta \] or \[\tan \theta =1\] (as \[AB\ne 0\]) or \[\theta ={{45}^{o}}\]


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