A beam contains 7.7 10⁶ doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 3.2 10⁵ m/s. What is (a) the magnitude of the current density and (b) direction of the current density J. (c) What additional quantity do you need to calculate the total current i in this ion beam?

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A beam contains 7.7 x 106 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 3.2 x 105 _) m/s. What is (a) the magnitude of the current density and (b) direction of the current density J .(c) What additional quantity do you need to calculate the total current i in this ion beam? (a) Number Units v (b) v (C) v