A beam contains 2 xx 10^(8) doubly charg...

A beam contains `2 xx 10^(8)` doubly charged positive ions per cubic centimeter, all of which are moving with a speed of `10^(5) m//s` . The current density is

`6.4 "A/m"^2`

`3.2 "A/m"^2`

`1.6 "A/m"^2`

None of these

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Verified by Experts

The correct Answer is:

`J=npv=n(ze)v=(2xx10^8xx1.6xx10^(-19)xx10^5)/((10^(-2))^3`
`=6.4A//m^2`

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