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In a hydrogen discharged tube it is observed that through a given cross-section $3.13 \times 10^{15}$ electrons are moving from right to left and $3.12 \times 10^{15}$ protons are moving from left to right. What is the electric current in the discharge tube and what is its direction?
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$1 \mathrm{~mA}$ towards right
$\mathrm{I}=\mathrm{n}_{\mathrm{e}} \mathrm{q}_{\mathrm{e}}+\mathrm{n}_{\mathrm{p}} \mathrm{q}_{\mathrm{E}}=1 \mathrm{~mA}$ (towardsright)
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