JEE Main & Advanced Mathematics Vector Algebra Question Bank Vector or Cross product of two vectors and its application

  • question_answer
    If \[\mathbf{a}\ne \mathbf{0},\,\,\mathbf{b}\ne \mathbf{0},\,\,\mathbf{c}\ne \mathbf{0}\], then true statement is [MP PET 1991]

    A)                 \[\mathbf{a}\times (\mathbf{b}+\mathbf{c})=(\mathbf{c}+\mathbf{b})\times \mathbf{a}\]   

    B)                 \[\mathbf{a}\,.\,(\mathbf{b}+\mathbf{c})=-(\mathbf{b}+\mathbf{c})\,.\,\mathbf{a}\]

    C)                 \[\mathbf{a}\times (\mathbf{b}-\mathbf{c})=(\mathbf{c}-\mathbf{b})\times \mathbf{a}\]

    D)                 \[\mathbf{a}\,.\,(\mathbf{b}-\mathbf{c})=(\mathbf{c}-\mathbf{b})\,.\,\mathbf{a}\]

    Correct Answer: C

    Solution :

                    It is obvious.


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