FIGURE 2 shows two parallel long straight rigid wires X and Y, each of the wire carry the current of 20 A and 10A in opposite directions. The wires are 1m apart. Determine the magnitude and direction of the magnetic flux density at point Q which is equidistance from wire X and wire Y. (from front view) Calculate the distance, r from wire X to point A where the resultant magnetic field strength is zero. (i) (ii)
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