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

A metal is heated in a furnace where a sensor is kept above the metal surface to read the power radiated (P) by the metal. The sensor has scale that displays log_2,(P//P_0) , where P_0 is constant. When the metal surface is at a temperature of 487^@C , the sensor shows a value 1. Assume that the emissivity of the metallic surface remains constant. What is the value displayed by the sensor when the temperature of the metal surface is raised to 2767^@C ?

An isolated conducting sphere of charge Q and radius R is connected to a similar uncharged sphere (kept at a large distance) by using a high resistance wire. After a long time is the amount of heat loss?

The radius of a metal sphere at room temperature T is R, and the coefficient of linear expansion of the metal is alpha . The sphere is heated a little by a temperature DeltaT so that its new temperature is T+DeltaT . The increase in the volume of the sphere is approsimately.

Give mode of heat transfer due to temperature difference.

If hydrogen gas is heated to a very high temperature, then the fraction of energy possessed by gas molecules correspond to rotational motion :-

How can you charge a metal sphere positively without touching it

The diagram shows the arrangement of three small uniformally charged spheres, A,B and C . The arrow indicate the direction of the electrostatic forces acting between the spheres (for example, the left arrow on sphere A indicates the electronstatic force on sphere A due to sphere B ). At least two of the spheres are positively charged. Which sphere, if any, could be negatively charged?

A sphere and a cube of same material and same total surface area are placed in the same evaculated space turn by turn after they are heated to the same temperature. Find the ratio of their initial rates of cooling in the enclosure.