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# The conditions necessary for production of cathode rays are :

$\begin{array}{1 1}(a)\;) High\;pressure,\; low\; voltage \\(b)\;Low\; pressure,\; low\; voltage\\(c)\;Low\; pressure,\; high\; voltage \\(d)\;High\; pressure,\; high\; voltage\end{array}$

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A)
For the production of cathode in discharge tube low pressure and high voltage current is required.