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JCECE Medical JCECE Medical Solved Paper-2004

  • question_answer
    The direction of vector \[\overset{\to }{\mathop{\text{A}}}\,\] is reversed. What are the values \[\Delta \overset{\to }{\mathop{\text{A}}}\,\] and \[\Delta |\overset{\to }{\mathop{\text{A}}}\,|\] ?

    A)  \[+\,2\vec{A},0\]

    B) \[+\,\vec{A},0\]

    C)  \[-\,\vec{A},0\]

    D)  \[-2\,\vec{A},0\]

    Correct Answer: D

    Solution :

     Key Idea: When direction of a vector is reversed it has same magnitude but -with minus sign. The value of \[\Delta \vec{A}={{\vec{A}}_{2}}-{{\vec{A}}_{1}}\] Given, \[{{\vec{A}}_{1}}=,A,{{\vec{A}}_{2}}=-A\] \[\therefore \] \[\Delta \,\vec{A}=-A-A=-2\,\vec{A}\] Also, \[|\vec{A}|=|-\vec{A}|\] \[\therefore \] \[\Delta |\vec{A}|=0\]


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