A cathode emits 1.8xx10^(17) electron pe...

A cathode emits `1.8xx10^(17)` electron per second and all the electrons reach the anode when it Is given a positive potential of `400V`. Given `e=1.6xx10^(-19)`C, the maximum anode current is .

`2.88mA`

`28.8mA`

`7.2mA`

`6.4mA`

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The correct Answer is:

`i=("ne")/t`

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