Answer:
The sconce refers to the wall lights, this is light fixtures that appear on the wall, and provide lighting. They can be located inside and outside of the buildings, although their function is mainly decorative. The light goes upwards and the sconce also can hold a candle or a torch. It is mostly made of silver or brass.
Given:
Potential difference between capacitor plates = 2.6 V
Dielectric constant of paper , K = 3.7
Solution:
When air is filled, let the potential difference between capacitor plate be V'
Now, after being disconnected from the battery, the charge stored in the capacitor will remain constant
And when dielectric is introduced between the capacitor plates, the potential difference will be reduced by k times a:
V = 
Therfore, V' = KV = 3.7 × 2.6 = 9.62 V
The resulting potential difference of the capacitor, V' = 9.62 V
I think you should use a comma instead of a colon. I am unsure of the question but I hope this helps.