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Snehasish Ghosh posted an Question
July 08, 2020 • 05:21 am 30 points
  • IIT JAM
  • Physics (PH)

Please explain why is x taken as negative here..in the pic.

Please explain why is x taken as negative here in the pic.

2 Answer(s) Answer Now
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    Dhairya sharma

    If two points on a line are (x1,y1,z1) and (x2,y2,z2) then the line can be represented in vector form as (x2-x1)i^+(y2-y1)j^+(z2-z1)k^. Now in above question, for vector 'A' , the two known points are (1,0,0) and (0,2,0). Hence vector 'A' can be written as (0-1)i^+(2-0)j^+(0-0)k^ -i^+2j^. Similarly for vector 'B' the two known points are (1,0,0) and (0,0,3) hence 'B' can be represented as (0-1)i^+(0-0)j^+(3-0)k^ -i^+3k^

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    https://youtu.be/mSRxq6gNBns

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    it will help u

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    👍

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    👍

  • comment-profile-img>
    Deepak singh 1 Best Answer

    see attached

    cropped1395036555.jpg
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    if any doubt please ask.

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    how is the coordinates of A (1,0,0)

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    look at end points of vector A , see attached

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    did not understand sir

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    see this ,

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    Sir,I will accept your answer..

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    Sir if the points of A are on x axis and y axis,then why is the coordinate of A 1,0,0 ...I mean why is the y coordinate 0 then

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    end points of vector A (point ) is on x axis... point

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    It is also in y- axis na?

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    points on x axis is of type ( x,0,0)

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    But the vector A has end points in y axis also

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    wait

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    Sir,I understood

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    I have used this result

  • comment-profile-img>
    Chandra prakash

    wait dear I want to send you link which is usefull for you

  • comment-profile-img>
    Ravi prakash yadav best-answer

    If two points on a line are (x1,y1,z1) and (x2,y2,z2) then the line can be represented in vector form as (x2-x1)i^+(y2-y1)j^+(z2-z1)k^. Now in above question, for vector 'A' , the two known points are (1,0,0) and (0,2,0). Hence vector 'A' can be written as (0-1)i^+(2-0)j^+(0-0)k^ -i^+2j^. Similarly for vector 'B' the two known points are (1,0,0) and (0,0,3) hence 'B' can be represented as (0-1)i^+(0-0)j^+(3-0)k^ -i^+3k^

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    how is the coordinates of A (1,0,0)

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    'A' is not a point,it is a vector. It has two end points having coordinates (1,0,0) and (0,2,0)

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