Hand written solution required

Question 8 (a) Explain briefly what you understand by Ampere's circuital law: f B - dl = Hol. [2 marks] ( b ) Eight long parallel wires cut the page perpendicularly at the points shown. A wire labelled with the integer k (k = 1, 2. ..., 8) carries the current 2k times do (1.e., Ig = 2k lo ). For those with k = 1 to 4, the current flows up out of the page, for the rest, the current flows down into the page. Evaluate of B . di along the closed path (see figure 4) in the direction indicated by the arrowhead. Explain how you arrived at your answer. [7 marks] 3 6 5 10 Figure 4 (c) Can you use a single application of Ampere's Law to find the field at a point in the vicinity of the eight wires? Why? Describe briefly the steps you would follow to find the field at an arbitrary point P? [4 marks]