Hi, I am working on the fault diagnosis of the substation grounding grid. I want to calculate the derivative of magnetic flux density along the radial line...Could anyone help how to take this derivative. Like we have x and y-axis if i draw a line y=x and then take derivative with respect to that line. What i did is r=sqrt(x^2+y^2) and the find d/dr but this is wrong......![]()
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