Electromagnetic Theory 2019 20 Q1 1 (65.82 KiB) Viewed 35 times
2019-20 Q1
1. (a) According to the Biot-Savart law, the element of magnetic induction field, dB(r), at position, r, that arises from an element of current, j(r'), at position, r', is given by dB(r) = Ho j(r') x (r- r') 41 Ir – r'|3 dr' (i) Sketch the vector field j(r') x (r-r') around a long, thin, straight wire, which carries a steady current, with current density, j(r), and passes through the coordinate origin. Show clearly each of these vectors and the direction of the field. [4 marks]
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