Q 2653780644.     How much (in per cent) has a filament diameter decreased due to evaporation if the maintenance of the previous temperature required an increase of the voltage by `eta = 1.0%?` The amount of heat transferred from the filament into surrounding space is assumed to be proportional to the filament surface area

A

`2 %`

B

`1 %`

C

`0.5 %`

D

`1.2 %`

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