Physics · Magnetism
A semi-infinite, thin wire extending from -∞ to zero along the z-axis carries a constant current I in the positive z-direction. The wire is charge-neutral except at z = 0, where the inflowing charge accumulates. What is the absolute value of the line integral 4μ0I∮ B·dl along the circle x2 + y2 = 1? Assume that the accumulated charge at z = 0 is a point charge.
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