Question: s discussed in the class, the electric field vector J is related to the current density vector E through the following relation where the conductivity

s discussed in the class, the electric field vector J is related to the current density vector E through the following relation where the conductivity is a quantity that multiplies the vector E in order to obtain the vector J. When quantities such as here relate two vectors in this way, we call them as tensors of the second rank or second order. (1) Write down in full the equations for , and explain your notation

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