NEET Class neet Answered
how did we find the new charges from the percentage.
![question image](http://images.topperlearning.com/topper/new-ate/top_mob16732429271045681366Screenshot_20230109-111018.jpg)
Asked by ayazanwarneet | 09 Jan, 2023, 11:12: AM
Let initial charges are q1 and q2
Force F between them ,
= 100 N
![begin mathsize 14px style F space equals space K space fraction numerator q subscript 1 q subscript 2 over denominator d squared end fraction end style](https://images.topperlearning.com/topper/tinymce/cache/3599e3ebeab6f7bedc9b570ca17ecb92.png)
where K = 1/(4
) is Coulomb's constant and d is distance between them .
![begin mathsize 14px style pi epsilon subscript o end style](https://images.topperlearning.com/topper/tinymce/cache/8a6c63110d5f97af6e99d78adeea05f3.png)
Let q1 is decreased by 10% , then magnitude of new charge = 0.9 q1
Let q2 is increased by 10% , then magnitude of new charge = 1.1 q2
Modified force F ' = ![begin mathsize 14px style 0.1 space cross times 0.9 space space K space fraction numerator q subscript 1 q subscript 2 over denominator d squared end fraction space equals space 0.99 space cross times 100 space N space equals space 99 space N end style](https://images.topperlearning.com/topper/tinymce/cache/a8b1e2c8994e03514ebd33254258b0d7.png)
![begin mathsize 14px style 0.1 space cross times 0.9 space space K space fraction numerator q subscript 1 q subscript 2 over denominator d squared end fraction space equals space 0.99 space cross times 100 space N space equals space 99 space N end style](https://images.topperlearning.com/topper/tinymce/cache/a8b1e2c8994e03514ebd33254258b0d7.png)
Answered by Thiyagarajan K | 09 Jan, 2023, 12:42: PM
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