Understanding Capacitors and Electric Potential

What is the primary function of a defibrillator in a medical emergency?

• To restart a stopped heart using electric shock

• To perform CPR automatically

• To inject medication into the bloodstream

• To monitor heart rate

What are the two main components of a capacitor?

• A resistor and a conductive plate

• Two parallel conductive plates and a dielectric

• A single conductive plate and a battery

• Two batteries and a connecting wire

How is electric potential energy similar to gravitational potential energy?

• Both are independent of the field involved

• Both can perform work when a force is applied over a distance

• Both depend on mass

• Both are always positive

What does the electric potential difference, or voltage, depend on?

• The type of test charge used

• The size of the test charge

• The color of the capacitor plates

• The electric field and the position in the field

What is the significance of the electric field in a capacitor?

• It only affects the outer appearance of the capacitor

• It determines the color of the capacitor

• It is irrelevant to the capacitor's function

• It helps in storing potential energy

How can capacitors be used in medical devices like defibrillators?

• To increase the device's weight

• To measure blood pressure

• To cool the device

• To store and quickly release electrical energy

What unit is used to measure capacitance?

• Amps

• Volts

• Farads

• Ohms

How does the distance between capacitor plates affect capacitance?

• Capacitance is only affected by the plate material

• Smaller distance increases capacitance

• Distance does not affect capacitance

• Greater distance increases capacitance

What is the role of a dielectric in a capacitor?

• To decrease the capacitance

• To conduct electricity between the plates

• To allow charge to jump between plates

• To increase the capacitance by preventing charge leakage

What does the energy density of an electric field describe?

• The total energy in the capacitor

• The amount of energy per unit volume in the field

• The resistance of the electric field

• The voltage across the capacitor