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(D) In a discharge tube,gas molecules are ionized due to various factors like cosmic rays or high potential differences. When a high potential differe

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$+ve$ ions,$-ve$ ions and electrons

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(D) In a discharge tube,gas molecules are ionized due to various factors like cosmic rays or high potential differences. When a high potential difference is applied,the electric field accelerates these charged particles. Collisions between these accelerated particles and neutral gas molecules lead to further ionization,creating a cascade of charge carriers. Specifically,electrons are detached from molecules,forming positive ions. At low pressures,these electrons can travel significant distances and may attach to other neutral molecules to form negative ions. Therefore,the current conduction in a discharge tube is carried by positive ions,negative ions,and electrons.

The current conduction in a discharge tube is due to

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