MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Hertz's Observations

An isolated m...

Question

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

Open in App

Solution

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.

Suggest Corrections

thumbs-up

1

Similar questions

Q. Name a substance used as cathode for thermionic emission. State its work function and the temperature to which it is to be heated for electron emission.

Thermionic emission from a heated filament varies with its temperature T as

Q. An electrically isolated hollow (initially uncharged), conducting sphere has a small positively charged ball suspended by an insulating rod from its inside surface, see diagram.
This causes the inner surface of the sphere to become negatively charged. When the ball is centred in the sphere the electric field outside the conducting sphere is

Q. An isolated solid metallic sphere is given +Q charge. The charge will be distributed on the sphere

Q. An iron body is at room temperature. Now it is heated and due to rise in temperature, it becomes red at high temperature. This phenomenon can be explained by

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Hertz's Observations

PHYSICS

Watch in App

explore_more_icon

Explore more

Hertz's Observations

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon