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meghaguptaa

We have been able to solve our ech query here due to our experts.This is a request from my side to all th experts to pl share their valuable tricks in every subject which they think are really beneficial, everyone of us would be real happy if we get som very good ones from you experts.

Admin

Hey Megha,

thats a great thought. not sure if the experts will be able to put random tricks here. but i also insist that the community should also come forward to share tricks that they have gathered with each other.... that ways each one will benefit from others in the community, and the community members will be able to fight the JEE battle with better arsenal.

cheers

~admin

PS: since its a community driven thread, we are returning Megha's nickels back.

shakirshafi12

i have studied nodal analysis,star delta transformation,maxwell,s loop current method,using these methods all questions of electricity(even tougher ones) becme fairly simple.you can find theses methods in any 1st year electrical engineering book.

shakirshafi12

In star delta transformation the star formation in the network is replaced by a delta or vice versa the resistance of the branches of the delta or star are calculated by making potential at the ends of the star and delta equal.

ruhi

hey thanx 4 the imformation.................take a salute frm my side

shakirshafi12

To calculate partial surface area this thing is used .

(it is very obvious).

it is used to calculate moment of inertia of a hollow sphere and also used in a space ship problem(where we have to calculate the variation of area viewed by an astronaut of the earth wrt time)(also it is used to get the results of center of mass using gravitaition,)(all those in VMC,s regular,s were given an additional question where this formula was used)

cuteangel

hey thanx buddy, u desrev salute

AAKRITI

which book do you have for nodal analysis,star delta transformation, maxwell loop current method

would it be helpful if i start it now,

i had asked my sir when he was teaching this chapter , he said i would get confused

shakirshafi12

if you really interested in engineering you can try electric engineering by B.L theraja (this book is also useful for 1st year engineering students) also it is very easy to understand concepts in that book however you can search net(google.com you will get whatever theory you want).

KAB

There is a powerful method to solve a problem esp.in maths(analytical geo.).
Find answer using options.Substitute the options in the given question to find the answer.Remember this is applicable only in objective questions and when the option none of these is not there.

It can also be applied to problems on summation or series.

In indefinite integral and differential eqns when there is no clue to proceed try differentiating options.

This sometimes saves a lot of time.

If you want shortcut fomulae buy Dinesh's Objective books.It contains millions of shortcut methods and formulae.

vpunithreddy

the paper setters of iit are not fools they always try to mislead u by options so be care full while doing such things

CooldudeRama17

see i am giving some links where some tricks are used

http://www.goiit.com/posts/list/2651.htm#10499 by shakirshafi12 solved by puneet bhaiya

http://www.goiit.com/posts/list/1407.htm#5056 by shakirshafi12 solved by rahul_c

http://www.goiit.com/posts/list/2556.htm#9975 by priyatamau solved by shakirshafi12

http://www.goiit.com/posts/list/1681.htm#6831 by peter pete solved by titun

http://www.goiit.com/posts/list/1010.htm by nishant solved by shakirshafi12

http://www.goiit.com/posts/list/2622.htm#10210 by aakriti given by vinu

http://www.goiit.com/posts/list/2475.htm#9793 by anup solved by vinu

they all have some goodtricks

nunoxic

guyz i dunno why most ppl who i know dun use this even though they know of it
when u have a limit sum 90% of the time L'Hospital Gives u answer within 2 steps with almost no scope to go wrong (considering u differentiate correctly)

KAB

Here are some shorcuts which you should never ever forget!

1)Area of the triangle made by the line ax+by+c=0 and the co ordinate axes is c²/(2ab)

2)Area of the rhombus formed by ax(+or-)by(+or-)c=0 is 2c²/ab

3)If ABCD is parallelogram

then D=A-B+C

Eg:If (1,6),(2,5),(5,1) are three vertices of a parallelogram

then fourth vertex is (1-2+5,6-5+1) ie(4,2)

4)The foot of the perpendicular (h,k) from (x₁,y₁) to the line ax+by+c=0 is given by

(h-x₁)/a=(k-y₁)/b= -(ax₁+by₁+c)/(a²+b²)

5)The image or reflection of the point (x₁,y₁) in the line ax+by+c=0 is (h,k) where

(h-x₁)/a=(k-y₁)/b= -2(ax₁+by₁+c)/(a²+b²)

6)The area bounded by y²=4ax andx²=4by is given by (4a)(4b)/3

7)The area bounde

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