If a sheet of aluminium foil of negligible thickness is placed exactly at the centre of the two plates of a parallel plate condenser and the foil is connected to the upper plate, then the capacitance is doubled since d is reduced to half.
Asked by harinderamit1234
25th September 2018,
1:05 PM
Answered by Expert
Answer:
Capacitance C = ε0A/d , where A is area of plates and d is separation distance between plate.
When a thin aluminium foil is placed exactly at middle of plates and connected to upper plate,
then aluminium foil acts as one of plates of the capacitor. hence the distance is reduced to d/2
Now the capacitance 
, hence capacitance doubles
, hence capacitance doubles
Answered by Expert
25th September 2018,
1:59 PM
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