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An ionization chamber with parallel cond...

An ionization chamber with parallel conducting plates as anode and cathode has `5 xx 10^(7)` electrons and the same number of singly-charged positive ions per `cm^(2)`. The electrons are moving at `0.4 m//s`. The current density from anode to cathodes `4 mu A//m^(2)`. The velocity of positive ions moving towards cathode is

A

`0.4 m//s`

B

`16m//s`

C

Zero

D

`0.1 m//s`

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The correct Answer is:
D
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