1.

In a hydrogen discharge tube, the number of protons drifitin across a cross section per second is `1.0xx10^(18)`, while the number of electrons drifting in the opposite direction across the same cross section is `2.7xx 10^(18)` per second. Find the curernt flowing in the tube.

Answer» As electrons and protons are moving in the opposite
directions, they will effectively produce current in the same
direcition and the total current in the tube is
`I = (n_p + n_e)e//t`
`=(1.0xx10^(18) +2.7xx10^(18)) xx1.6xx10^(-19)//1`
`=3.7xx1.6xx10^(-1)A = 0.592 A`


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