How much has a filament diameter decreased due to evaporation  if the mainteenance
Channel: Doubtnut
Date: 2020-08-23

How much has a filament diameter decreased due to evaporation  if the mainteenance of the previous temperature required an increase of voltage by `eta=1.0%`. The amount of heat transferred from the filament to surrounding space is assumed to be proportional to the filament surface area.