Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Electric Conduction Takes Place in a Discharge Tube Due to the Movement of (A) Positive Ions (B) Negative Ions (C) Electrons (D) Protons - Physics

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Short Note

Electric conduction takes place in a discharge tube due to the movement of _____________ .
(a) positive ions
(b) negative ions
(c) electrons
(d) protons

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Solution

(a) positive ions
(b) negative ions
(c) electrons

Some ions are always present in gases due to cosmic rays and other factors. When we apply potential difference  across a discharge tube, the ions get accelerated due to the electric field. If the potential difference is large, then the ions get enough energy to ionise the molecules on collision.
Thus, a large number of ions are produced and conduction starts. Generally, an electron gets detached from a molecule to make the molecule a positive ion. At low pressure, this electron moves through a large distance and gets attached to another molecule and forms a negative ion.
Thus, electric conduction takes place in a discharge tube due to the movement of positive ions, negative ions and electrons.

Concept: Concept of Semiconductor Electronics: Materials, Devices and Simple Circuits
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APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 19 Electric Current through Gases
Q 1 | Page 352
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