In a hydrogen discharge tube, the number of protons drifting across a cross-section per second 1.0 × 10¹⁸, while the number of electrons drifting in the opposite direction across the same cross-section is 2.7 × 10¹⁸, per second then current (in A) flowing in the tube will be

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answer is 0.59.

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Detailed Solution

As electrons and protons are moving in the opposite direction, they will effectively produce current in the same direction and the total current in the tube is

$I = (n_{p} + n_{e}) e / t$

$= (1.0 \times 10^{18} + 2.7 \times 10^{18}) \times 1.6 \times 10^{- 19 / 1}$

$= 3.7 \times 1.6 \times 10^{- 1} A = 0.592 A$

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