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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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thanks for teaching sir

3 years ago by Satish

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sir in this y is equal to r /tan theta ….u have take theta at diff pt

4 years ago by

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Sir, shouldn't r = y.tan ?? In the above video, you wrote y = r.tan ?

6 years ago by Ivan Koshy

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Sir, if I take y=r cot(theta) , What is wrong in taking this?

7 years ago by Amit Vikram Raj

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well then you will get UoI/4piR * integration of ln(cossecQ cot Q) limits from 0 to pi... probably going to yield the same answer in a more complicated way

7 years ago by ABHISHEK SHANKAR

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sir how u come 2 knw that this particular substitution is required ???

7 years ago by rameh hooyex

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well you can see the expressions differentiation lies in the numerator like of the form f '(x) / f(x) and plus it is in the form of 1/x^2 a^2... you might have studied in integration that in such cases you first substitute x as AtanQ and see the expression that to yields... it is like a hit and trial method which in most cases is successful

7 years ago by ABHISHEK SHANKAR

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let y=rtan0 but sir i hope that it is y=r/tan0 by diagram shown

8 years ago by Devendra singh

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Here I have taken y=r tanT as a trigonometric substitution not the relation from the figure... consider this separately...

8 years ago by Physics Galaxy

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sir , please check the calculation once..(r=ytan(teta) )

10 years ago by ab vishal

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All calculations in this video are correct... theta which I have used in first step of sin(theta) is the one which is shown in figure and the theta which I have used for integration is just a substitution... you can see that further I am using at y = inf, theta will become pi/2 and theta in figure will approach to zero... I think now you have got it...

10 years ago by Physics Galaxy

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Hello Sir, Please check the tan theta formula again because r/y = tan theta then how come y = r tan theta??? Please check it again sir.....

10 years ago by Dr.Madhu Sharma

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In this analysis I am using y = r tan (theta) as trig substitution for integration it is not related to the diagram... pl check it carefully... its correct...

9 years ago by Physics Galaxy

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Video Lectures

High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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