A thin wire of length l and surface area A is heated to a temperature T. Its electrci resistance is R, emissivity of its surface is e. How much electric current should be maintained through the wire so as. To maintain its temperature at T ? Assume the temperature of surroundings to be negligible compared to T. Use Stefan.s constant as sigma :

A thin wire of length l and surface area A is heated to a temperature

1.	A thin wire of length l and surface area A is heated to a temperature T. Its electrci resistance is R, emissivity of its surface is e. How much electric current should be maintained through the wire so as. To maintain its temperature at T ? Assume the temperature of surroundings to be negligible compared to T. Use Stefan.s constant as sigma :
Answer» `(EA sigmaT^(4))/( R )` `(e sigmaT^(4)//R)^((1)/(2))` `((eA sigmaT^(4))^((1)/(2)))/( R )` `((eA sigmaT^(4))/( R ))^((1)/(2))` ANSWER :D