Capacitors and Their Applications

What is the primary function of a capacitor?

• To generate electricity

• To store charge

• To amplify signals

• To convert AC to DC

In the context of capacitance, what does the unit 'farad' represent?

• Watt per Second

• Coulomb per Volt

• Joule per Coulomb

• Volt per Ampere

If the voltage across a capacitor is doubled, what happens to the charge stored?

• It remains the same

• It is quadrupled

• It is doubled

• It is halved

What is the relationship between charge (Q), voltage (V), and capacitance (C) in a capacitor?

• Q = C/V

• C = V/Q

• V = Q/C

• C = Q/V

What is the conventional direction of current flow in a circuit?

• Randomly in all directions

• From negative to positive

• In a circular motion

• From positive to negative

How does increasing the distance between the plates of a parallel plate capacitor affect its capacitance?

• Decreases capacitance

• Doubles the capacitance

• Increases capacitance

• No effect on capacitance

What is the effect of inserting a dielectric material between the plates of a capacitor?

• Reverses the polarity

• No effect on capacitance

• Increases capacitance

• Decreases capacitance

What happens to the capacitance if the area of the plates in a parallel plate capacitor is quadrupled?

• It is quadrupled

• It is halved

• It is doubled

• It remains the same

Which of the following materials is likely to have a dielectric constant greater than one?

• Vacuum

• Air

• Glass

• None of the above

What is the formula for the potential energy stored in a capacitor?

• 1/2 QV^2

• QV

• CV

• 1/2 CV^2