Example 2 magnetic field (Biot-Savart's law)

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Practice exercise 7.3:

A thin ring of radius 5cm is placed on plane z=1 so that its center at (0,0,1). If ring carries 50 mA along a_ϕ find H at (0,0,-1) and (0,0,10)

This question is taken from book of Principle of electromagnetics 6th edition by Sadiku and Kulkarni
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