question_answer

In a hydrogen discharge 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                                     [AFMC 1996]           

A)            \[1\,mA\,\]towards right

B)            \[1mA\] towards left

C)            \[2mA\] towards left        

D)            \[2\,mA\] towards right