Eight wires cut the page perpendicularly at the points shown in Figure. A wire labeled with the

Question:

Eight wires cut the page perpendicularly at the points shown in Figure. A wire labeled with the integer k (k = 1, 2. 8) carries the current k i, where i = 4.50 mA. For those wires with odd k. the current is out of the page; for those with even k, it is into the page. Evaluate ф B ?? d s along the closed path in the direction shown.