A Toroidal Coil Has A Rectangular Cross Section With Inner

A toroidal coil has a rectangular cross section, with inner radius a, outer radius a + w, and height h. It carries a total of N tightly wound turns, and the current is increasing at a constant rate (dl/dt = k). If w and h are both much less than a, find the electric field at a point z above the center of the to roid.

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