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11.2: Напруга, пов'язана з полем
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Using the usual mathematical definition of the slope, and writing $V$ for the height in order to remind us of the electrical analogy, the slope along such a line is $dV/dx$ (the rise over the run)...Using the usual mathematical definition of the slope, and writing $V$ for the height in order to remind us of the electrical analogy, the slope along such a line is $dV/dx$ (the rise over the run). Determine the positive and negative signs of $dV/dx$ and $dV/dy$ , and relate these to the direction of the force that is pushing the current forward against the resistance of friction. (b) If you wanted to find a lot of electric charge on this map, where would you look?