In a hydrogen discharge tube it is observed that through a given cross-section 3.13 × 1015 electrons are moving from right to left and 3.12 × 1015 protons are moving from left to right. What is the electric current in the discharge tube and what is its direction 

(1) 1 mA towards right

(2) 1 mA towards left

(3) 2 mA towards left

(4) 2 mA towards right

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