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J & K CET Medical J & K - CET Medical Solved Paper-2009

  • question_answer
    Magnitudes of four pairs of displacement vectors are given. Which pair of displacement vectors, under vector addition, fails to give a resultant vector of magnitude 3 cm?

    A)  2 cm, 7 cm                         

    B)  1 cm, 4 cm

    C)  2 cm, 3 cm                         

    D)  2 cm, 4 cm

    Correct Answer: A

    Solution :

                     If two vectors A and B are given the range of their   resultant   can   be   written   as \[(A-B)\le R\le (A+B)\]ie,\[{{R}_{\max }}=A+B\]and\[{{R}_{\min }}=A-B\]. If\[B=7\]and\[A=2,\]then their resultant will be in between 5 and 9. So, 3 cm cannot be the resultant of the pair.


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