A beam contains 2.0 × 10^8 doubly charged positive ions per cubic centimeter

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A beam contains 2.0 × 10^8 doubly charged positive ions per cubic centimeter, all of which are moving toward north with a speed of 1.0×10^5 m/s. (a) what are the magnitude and direction of the current density J→? (b) can you calculate the total current i in this ion beam? If not what additional informaiton in needed.
10
Nov
A beam contains 2.0 × 10^8 doubly charged positive ions per cubic centimeter, all of which are moving toward north with a speed of 1.0×10^5 m/s. (a) what are the magnitude and direction of the current density J→? (b) can you calculate the total current i in this ion beam? If not what additional informaiton [...]
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