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Snehasish Ghosh posted an Question
July 09, 2020 • 03:52 am 30 points
  • IIT JAM
  • Physics (PH)

Please explain this sum in as simple as possible way.

2 Answer(s) Answer Now
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  • comment-profile-img>
    Chandra prakash

    dear negative sign come bcoz... plan is in negative direction... which you study here.. so negative sign come in that case

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    Sir,I didn't understand

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    dear plz tell me what u want to ask ...

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    which plan?

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    Sir, also in the second line, why is da=- dydz

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    How did this minus come?

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    dear I think u talked about 2nd plan.. let's see again carefully plan 2nd is in negative coordinates.. I means just behind... so area element is negative include..

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    dear let's see... 2nd plan.. carefully.. and visualize this.. u see that direction of normal of 2nd plan is just behind.. it's means it's opposite to +x direction it's Means it's negative... right...

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    dear... I hope you got it

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    ??

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    ??

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    Sir,I got it.

  • comment-profile-img>
    Chandra prakash

    sides of cube may very from 0 to maximum value which is 0 to 2 here.....best regards

  • comment-profile-img>
    Dhairya sharma Best Answer

    sides of cube may very from 0 to maximum value which is 0 to 2 here

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    So limit of x,y,z will be same?

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    yes bcoz it's a cube

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    Ok Ma'am, got it...Thank you...

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    wc

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    Ma'am, also in the second line, why is da=- dydz

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    How did the minus come?

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    dear reason for -ve sign is that....see figure carefully it's y and z plane and area is dydz and direction of this plane is opposite to the x axis so here -ve sign is for directional convention

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    see it

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