Physics-
General
Easy

Question

In a neon discharge tube 2.9 cross times 1 0 to the power of 18 end exponent N e to the power of plus end exponent ions move to the right each second while 1.2 cross times 1 0 to the power of 18 end exponent electrons move to the left per second. Electron charge is 1.6 cross times 1 0 to the power of negative 19 end exponent C. The current in the discharge tube

  1. 1 A towards right    
  2. 0.66 A towards right    
  3. 0.66 A towards left    
  4. Zero    

The correct answer is: 0.66 A towards right


    Net current i equals i subscript plus end subscript plus i subscript minus end subscript equals fraction numerator left parenthesis n subscript plus end subscript right parenthesis left parenthesis q subscript plus end subscript right parenthesis over denominator t end fraction plus fraction numerator left parenthesis n subscript minus end subscript right parenthesis left parenthesis q subscript minus end subscript right parenthesis over denominator t end fraction

    Þ i equals fraction numerator left parenthesis n subscript plus end subscript right parenthesis over denominator t end fraction cross times e plus fraction numerator left parenthesis n subscript minus end subscript right parenthesis over denominator t end fraction cross times e
    equals 2.9 cross times 1 0 to the power of 18 end exponent cross times 1.6 cross times 1 0 to the power of negative 19 end exponent plus 1.2 cross times 1 0 to the power of 18 end exponent cross times 1.6 cross times 1 0 to the power of negative 19 end exponent
    Þ i equals 0.66 A

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