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Q. As shown in the figure, a very thin sheet of aluminium is placed in between the plates of the condenser. Then the capacityPhysics Question Image

Electrostatic Potential and Capacitance

Solution:

Since aluminium is a metal, therefore field inside this will be zero. Hence it would not affect the field in between the two plates, so capacity $=\frac{q}{V}=\frac{q}{E d}$ remains unchanged.