Question

{ At a point high in the Earth's atmosphere, }He^{2+} ions in a concentration of }2.8×10^{12}/m^3 are moving due noth }}{ at a speed of }2.0×10^6m/s . Also, a }7.0×10^{11}/m^3 concentration of }O_2^- ions is moving due south at a speed }}{ of }7.2×10^° m/s . Determine the magnitude and direction of the net current passing through unit area (AM)?

Answer 1