1.

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
Answer» B.            \[1mA\] towards left


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