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

Silk cloth has excess of electrons, so it becomes positively charged.

Heat energy flows from high temperature to low temperature

Let i_0 be the thermionic current from a metal surface when the absolute temperature of the surface is T_0 . The temperature is slowly increased and the thermionic current is measured as a function of temperature. Which of the following plots may represent the variation in (i/i_0) against (T/T_0) ?

A piece of glass is heated to a high temperature and then allowed to cool. If it cracks, a probable reason for this is the following property of glass

An uncharged metal sphere is placed between two equal and oppositely charged metal plates. The nature of line of force will be

A metallic sphere having no net charge is placed near a finite metal plate carrying a positive charge. The electric force on the sphere will be

An siolated metal sphere of radius 'r' is given a charge 'q' . The potential energy of the sphere is

If objects of equal masses are given equal heat, their final temperature will be different, this is due to difference in their................ .