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Commentator

Join Date: Jan 2011
Location: India
Posts: 70

11/02/2011 1:15 AM

Dear friends,

Force = B.I.L

Conductor area does't play any role in generated force????

My Doubt is if

L = 100 meter

I = 10 Amps

B= 1 tesla

with 1Square mm & 0.5 Square mm of area, Will same force generates?????

With regards,

Amith N

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Guru

Join Date: May 2009
Location: Richland, WA, USA
Posts: 20971
#1

11/02/2011 1:56 AM

Yes, it will be the same force, so long as B, I, and L remain the same.

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Guru

Join Date: Oct 2009
Posts: 2061
#2

11/02/2011 4:17 AM

Have you not heard of skin effect? The tendency of alternating current is to concentrate more on the 'skin' or the circumference of the conductor rather than on the core. Hence, irrespective of the cross section, a major portion of the current will be in the exteriors of the conductor. As forces are acting outsied the conductor (either attractive or repulsive) the circumferential current is significant rather than the core current.

Power-User

Join Date: Oct 2006
Location: Kolkata, India
Posts: 448
#3

11/02/2011 7:00 AM

If you can break the 'B' into equation, you will find the ans.

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Anonymous Poster #1
#4

11/02/2011 10:10 AM

DC Current? No skin effect but the force remains the same.

OP: The force ahs nothing to do with the conductor - it is the interaction of the magnets - the flowing current creates a magnetic field and that field interacts with the other conductor's magnetic field/ external magnetic Field and that creates the force.

If you want the stress on teh conductor then of course the crossection and would come in but that is another subject (more on the mechanical side)