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26 May 2009 16:53:08 IST

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AIEEE question 1 code A

None

AIEEE question 1 code A

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Kevin

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26 May 2009 16:53:20 IST

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Statement ? 1: For a charged particle moving from point P to point Q, the net work done by anelectrostatic field on the particle is independent of the path connecting point P to point Q.Statement-2: The net work done by a conservative force on an object moving along a closed loop iszero(1) Statement-1 is true, Statement-2 is false(2) Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.(3) Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.(4) Statement-1 is false, Statement-2 is true

Kevin

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26 May 2009 16:55:04 IST

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i think the answer shud be 3...but many places its given as 2...only narayana has given it as 3......it shud be that statement 1 is the correct explanation for statement 2 and nt the reverse......m confused wat is rite?

Kevin

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26 May 2009 16:57:45 IST

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pl rep

DEBARUN SENGUPTA

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26 May 2009 17:03:12 IST

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I feel that the ans is 3 too

Not only narayana but VMC and Triumph academy has also given 3 as the correct ans.

hope for the best..........

rate if useful!!!!!!!!!!!!1

Kevin

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26 May 2009 17:19:19 IST

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AIEEE question 1 code A

Kevin

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26 May 2009 17:19:22 IST

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hey thanks for the reply man..

adi

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26 May 2009 20:23:09 IST

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im sure assertion is rit and reason is correct explanation for assertion

gokusuper

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26 May 2009 20:24:28 IST

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i think it is correct explanation

Abhimanyu

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26 May 2009 20:25:09 IST

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ya ans is 3

Nishant Pandey

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26 May 2009 20:31:19 IST

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ans is 3...............can not treated as correct exp. yar

JEE2010 ..

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26 May 2009 20:50:13 IST

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yes , even i think as 3..i will rate others post!!

m aditya

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27 May 2009 19:39:30 IST

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ya ITS ,3

Kevin

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28 May 2009 16:17:26 IST

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dats wat i think too...it should be 3 as its not the correct explanation

Kevin

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28 May 2009 16:33:13 IST

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more discussions needed..ne1 else with 3? i.e both are true but reason not correct explanation?

Akshay

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28 May 2009 17:01:37 IST

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answer is 2)

the reason is the correct explanation as 2) is the defining statement of a conservative force

1) is true because of 2)

and 1) can be proved mathematically using 2)...

ie a force cannot be conservative if 2) isnt true and 1) can be true even if 2) isnt for a non conservative force,

im sure u must have come across

the example given in IE Irodov

consider a rough track of arbitrary shape

such as shown below...

the work done by friction in taking a body of mass m from A to B is -umgd u is the coefficient of friction

this can be proved by integration

clearly it is independent of path and depends only on horizontal separation between A to B

independent of path bet A n B(shape of curve)

but friction is not conservative as

the work done in a closed loop is not zero

see, work done in taking the body from B to A is also -umgd...

so net work done in taking m to B and bringing back it to A (work done by friction) is -2umgd

although it is independent of path between A and B (work is -2umgd irrespective of the shape of path bet. A n B)

but work done in closed loop isnt zero so friction isnt a conservative force.

2) is the defining statement of conservative force.. and it can be mathematically proved that 1) is true because 2) is.,,

Akshay

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28 May 2009 17:48:51 IST

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EDITED...koi toh dekho yaar

Kevin

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28 May 2009 17:54:05 IST

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because conservative force is path independent, u have it zero in a closed loop...apply common sense man.

Akshay

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28 May 2009 17:56:48 IST

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arey READ THE POST sir... work done is path independent doesnt imply it is zero in a closed loop

thats what ive been screaming in the above post....which u didnt read.!!!

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