In a region $10^{19}$ $\alpha -$ particels and $10^{19}$ protons per second move to the left, while $10^{19}$ electrons moves to the right per second. The current is
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Current due to protons and $\alpha$ -particles is towards left and as ${e^ - }$ have $-$ ive charge, so current due to electrons is also towards left
$\therefore $ total current $\mathrm{I}=(2 \mathrm{e}+\mathrm{e}+\mathrm{e}) \times 10^{19}$
${=4 \times 1.6 \times 10^{-19} \times 10^{19}} $
${=6.4 \mathrm{\,A}}$
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