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In a neon gas discharge tube ${Ne}^{+}$ ions moving through a cross-section of the tube each second to the right is $2 .9 \times 10^{18},$ while $1 .2 \times 10^{18}$ electrons move towards left in the same time; the electronic charge being $1 .6 \times 10^{- 19} C,$ the net electric current is

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Correct option is B

As the electrons carry a negative charge the resultant current, $I = (2 .9 \times 10^{18} + 1 .2 \times 10^{18}) \times 1 .6 \times 10^{- 19}$ towards right

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In a neon gas discharge tube Ne+ ions moving through a cross-section of the tube each second to the right is 2.9×1018, while 1.2×1018 electrons move towards left in the same time; the electronic charge being 1.6×10−19C, the net electric current is