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Blazing goIITian

Joined:	16 Mar 2008
Post:	1825

18 Jul 2009 09:06:00 IST

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294

electro doubts ....... very confusing

Kinematics , NewtonsLawsCirMotion , Work Power Energy collisions , Rotation , Gravitation , Simple Harmonic Motion , Fluid Mechanics , Materials Wave Sound , Super Position , units dimensions , com momentum , shm , wave sound

a long cylindrical conductor of radius R carries a current i. the current density is a function of radius j=br,where b is a constant.find an expression for a magnetic field

wat a distance r1 when r1<R

and at distance r1 when r2>R

i know the steps but somehow its not coming

i used

j=br or j=bdr ....

so i=ja=bdr*pier^2

solving we get it br³/3

so substituing wwe get I=bR³/3

2pier=ubr^3/3

now substitng the valie of i with respect to the constant we get the answer as

so 1₂=i(r/R)³

now substituting the value we get

ubr^2/6 but the actual answer is ubr^2/3

ps anyone solve my query fast

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Comments (3)

bladeX -rise of a new sun

Blazing goIITian

Joined: 12 Dec 2007

Posts: 1249

18 Jul 2009 09:10:45 IST

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ask

VARUN RAJ

Blazing goIITian

Joined: 16 Mar 2008

Posts: 1825

18 Jul 2009 09:41:44 IST

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anyways i solved it was assuming the area of the cyinder as pier^2 it is 2pier^2.......so silly of me

bladeX -rise of a new sun

Blazing goIITian

Joined: 12 Dec 2007

Posts: 1249

18 Jul 2009 09:54:16 IST

Like 0 people liked this

.......................ok

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