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C23-5 Similar to temperature gradient $$\vec{E} = -\vec{\nabla}V=-<\hat{i}{\partial V \over \partial x}, \ \hat{j}{\partial V \over \partial y},\ \hat{k}{\partial V \over \partial z}>$$ Caution range of validity can depend on how these were computed for a given geometry Canonical Hub: CANONICA...