What are the units for the right side of this equation?

  • Thread starter Thread starter smithj1990
  • Start date Start date
  • Tags Tags
    Units
Click For Summary

Homework Help Overview

The discussion revolves around the units of the right side of the equation involving the curl of the magnetic field \(\nabla\times\mathbf{B}\) and its relation to current density \(\mathbf{J}\) and the time derivative of the electric field \(\frac{\partial\mathbf{E}}{\partial t}\). Participants are exploring the fundamental units involved in electromagnetism.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants are attempting to identify the units for each term in the equation and are questioning how these units relate to one another. There is a focus on expressing the units in terms of fundamental mksA units and clarifying the implications of taking the curl of the magnetic field.

Discussion Status

The discussion is ongoing, with participants providing insights into the units for Tesla and expressing uncertainty about the vector curl operation. Some guidance has been offered regarding resources for understanding units, but no consensus has been reached on the complete unit analysis.

Contextual Notes

Participants are encouraged to reference their textbooks or external resources for unit conversions and definitions, indicating a reliance on external materials for clarification. There is also mention of the need for units to match across the equation's terms.

smithj1990
Messages
5
Reaction score
0
[itex] \nabla\times\mathbf{B} = \mu_o\mathbf{J} + \mu_0\epsilon_0\frac{\partial\mathbf{E}}{\partial t}[/itex]

someone tell me what the units are for the right side of this equation?

is it T*(m^2)/s ?
 
Physics news on Phys.org
smithj1990 said:
[itex] \nabla\times\mathbf{B} = \mu_o\mathbf{J} + \mu_0\epsilon_0\frac{\partial\mathbf{E}}{\partial t}[/itex]

someone tell me what the units are for the right side of this equation?

is it T*(m^2)/s ?

The units have to be the same for the LHS and RHS of the equation, and the units have to match for the two terms on the RHS.

Can you show the units for each of the 3 terms (1 on LHS and 2 on RHS)? Start with the obvious units, and then express the composite units in terms of the fundamental mksA units...
 
well the left hand side is T and the first part of the right hand side is F*A/m and I am really not too sure about the rest..
 
smithj1990 said:
well the left hand side is T and the first part of the right hand side is F*A/m and I am really not too sure about the rest..

No, when you take the vector curl, what are you doing to the B field? And beyond that, what are the fundamental mksA units of a Tesla? Either your textbook should have a handy Units guide, or you can find one in the Internet. My Applied EM text by Plonus has a great Units guide inside the front cover, and a Vector Operations guide in all 3 coordinate systems inside the back cover...

And what are the units for each of the constants in the equation?
 
well i know that 1 Tesla is 1 kg/(A[tex]\dot[/tex]s^2)

i don't really understand vector curl.. i try to go about this by the integral approach over a closed loop. can someone explain this to me.. or at least tell me if my original thought is correct?
 
smithj1990 said:
well i know that 1 Tesla is 1 kg/(A[tex]\dot[/tex]s^2)

i don't really understand vector curl.. i try to go about this by the integral approach over a closed loop. can someone explain this to me.. or at least tell me if my original thought is correct?

Correct about the fundamental mksA units for Tesla. Where did you find that? Are the other expansions into fundamental mksA units given there for Volts, Farads, Coulombs, etc.?

For the vector curl, look at this "Useage" section of the wikipedia article for vector curl:

http://en.wikipedia.org/wiki/Curl_(mathematics )

Do you see what the operation does? How do you think the curl operator transforms the units of the B-field when you take the curl of B?
 
Last edited by a moderator:

Similar threads

  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 12 ·
Replies
12
Views
3K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
3
Views
1K
  • · Replies 8 ·
Replies
8
Views
3K