Capacitors

The capacitance of a parallel-plate capacitor can be increased by: 

• increasing the charge 
• decreasing the charge 
• increasing the plate separation
• decreasing the plate separation 

------------------------ is created out of two metal plates and an insulating material called a dielectric.

• An inductor
• A capacitor
• A fixed resistor
• A variable resistor

The figure to the right represents:

• Capacitor
• Diode
• Inductor
• Resistor

With respect to the capacitor, which relationship is true? •

• C = Q×V

• V = C×Q

• V = Q/C

• Q = C/V

How is the capacitance (C) of a parallel-plate capacitor affected by the charge on the plates ?

• C depend on the charge on the plates

• C is vanished when there are plates

• C does not depend on the charge on the plates

• C is accumulated on one side only

How is the capacitance of a parallel-plate capacitor affected by the potential difference across the capacitor ?

• C depend on the potential difference across the capacitor

• C does not depend on the potential difference across the capacitor

• C partially depend on the potential difference across the capacitor

• C sometime depend on the potential difference across the capacitor

How is the capacitance of a parallel-plate capacitor affected by the area of each plate?

• C is directly proportional to the area A of each plate

• C is inversely proportional to the area A of each plate

• C is partially proportional to the area A of each plate

• C is fully proportional to the area A of each plate

How is the capacitance of a parallel-plate capacitor affected by the distance between the plates ?

• C is directly proportional to the area A of each plate

• C is inversely proportional to the distance d between the plates

• C is partially proportional to the area A of each plate

• C is not affected by the area A of each plate

How is the capacitance of a parallel-plate capacitor affected by filling the space between the plates with an insulator ?

• C stable when the space between the plates is filled with an insulator, ε_r >1

• C reduces when the space between the plates is filled with an insulator, ε_r >1

• C increases when the space between the plates is filled with an insulator, ε_r >1

• C fluctuate when the space between the plates is filled with an insulator, ε_r >1

If C is the capacitance in Farads, ϵ permittivity of the dielectric, A area of plate overlap in square meters and d distance between plates in meters, then:

• C = ϵd/A 
• C = A/ϵd
• C = ϵA/d
• C = d/ϵA