Doubt from electrostatic

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olympaid problem inpho 2002 as i remember you can see solution their
concept E=\dfrac{\rho \vec l}{3\epsilon}

I am not getting INPho 2002 paper anywhere. Can u please attach link if u know

Then

Now I have included r..

If ans is wrong pls say me

U missed 'r' in ur calculation. And then answer is correct

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Sneha I checked but there is no such paper of inpho in 2002?

i m sorry if i wasted ur time but i m sure its olympaid problem its my notes problem my teacher told it belong to olympaid i dnt remember exact year

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