Question

In a Neon discharge tube 2.9 x 10¹⁸ Ne⁺ ions move to the right each second, while 1.2 x 10¹⁸ electrons move to the left per second, electron charge is 1.6 x 10^-19 C. The current in the discharge tube is 

(a) 1 A towards right 

(b) 0.66 A towards right 

(c) 0.66 A towards left 

(d) zero

Answer 1

The correct option is (b) 0.66 A towards right.

Explanation:

The direction of current in a circuit is, by convention, taken along the direction in which positive charges flow. Hence the current in the discharge tube flows towards right.