The electric intensity E, current density j and specific resistance k

AI Thread Summary
The relationship between electric intensity E, current density j, and specific resistance k is fundamental in understanding electrical circuits. Electric intensity is proportional to current density, while specific resistance inversely affects current flow. This relationship can be expressed through Ohm's law, which connects these variables in a linear manner. The discussion highlights the need for a comprehensive explanation of these concepts, indicating that the original query lacks sufficient detail. Understanding these relationships is crucial for analyzing electrical systems effectively.
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The electric intensity E, current density j and specific resistance k are related to each other by the relation
please explain
 
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animesh184 said:
The electric intensity E, current density j and specific resistance k are related to each other by the relation
please explain

Are you missing something in this post? This seems incomplete.
 
You are asking for a big portion of the book!
 
This is from Griffiths' Electrodynamics, 3rd edition, page 352. I am trying to calculate the divergence of the Maxwell stress tensor. The tensor is given as ##T_{ij} =\epsilon_0 (E_iE_j-\frac 1 2 \delta_{ij} E^2)+\frac 1 {\mu_0}(B_iB_j-\frac 1 2 \delta_{ij} B^2)##. To make things easier, I just want to focus on the part with the electrical field, i.e. I want to find the divergence of ##E_{ij}=E_iE_j-\frac 1 2 \delta_{ij}E^2##. In matrix form, this tensor should look like this...
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