Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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An Isolated Metal Sphere is Heated to a High Temperature. Will It Become Positively Charged Due to Thermionic Emission? - Physics

Short Note

An isolated metal sphere is heated to a high temperature. Will it become positively charged due to thermionic emission?

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Yes, it will become positively charged due to thermionic emission. When the metal sphere is heated, average kinetic energy of the electrons will increases, due to which, the free electrons of the metal sphere will be able to escape. As a result, they will leave a positive charge on the isolated metal sphere.

Concept: Electron Emission
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HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 19 Electric Current through Gases
Q 6 | Page 351
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