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

If a magnet is heated to a high temperature, it

Potassium carbonate when heated to high temperature.

Name: a positively charged non-metallic ion.

Carborundum is obtained when silica is heated at high temperature with

NaCl becomes paramagnetic at high temperature due to

''A black dot on as a porcelain cup apppears dark. But when heated to a high temperature it becomes brighter than the rest of the cup.'' Why ?

An isolated conducting spherical shell carries a negative charge. What will happe if a positively charged metal object is placed in contact with the shell interior? Assume that the positive charge is (a) less than (b) equal to (c ) greater than the negative charge in magnitude.

____ on heating to a very high temperature changes to a plasma.

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) ?

Two bodies are charged by rubbing one against the other. During the process, one becomes positively charged while the other becomes negatively charged. Then