sorry for posting the same problem but i wanted to know if i give the answer at link2 and i explain it base to my solution on link2 without saying which point is most accurate will i be awarded mark also or treated as wrong answer since already checken there is nothing wrong with the approach the answer also make sense right?

Here is the question from past year http://www.iitjee.org/iit-question-papers/iit-jee-2005-main/iit-jee-2005-physics-main-3.html and my solutions are at this 2 link. http://yfrog.com/5manswerlp and http://yfrog.com/jcanswer2p

Dear student,

Just focus on the approach and dont worry whether you will reach at the solution or not. Your methodology should be correct.

Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

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Sagar Singh

B.Tech, IIT Delhi