4th Quarter Summative Assessment

A capacitor is a device used to __________.

• dissipate energy

• dissipate power

• store magnetic energy

• store electrical energy

What is the value of the capacitance of a capacitor which has a voltage of 5 V and has a 10 C of charge?

• 2 F

• 5 F

• 15 F

• 50 F

Which of the following describes the electric potential inside a parallel-plate capacitor?

• It is constant.

• It increases linearly from the negative to the positive plate.

• It decreases linearly from the negative to the positive plate.

• It decreases inversely with distance from the negative plate.

Which of the following describes a series connection of capacitors?

• Total voltage is equal to the voltage drop in each capacitor.

• The total charge is equal to the sum of the individual charge.

• The equivalent capacitance is equal to the sum of the individual capacitance.

• The reciprocal of the equivalent capacitance is equal to the sum of the reciprocal of individual capacitance.

What is the capacitance in the network if two capacitors 2 μF and 3 μF are connected parallel?

• 6 μF

• 5 μF

• 1.5 μF

• 1 μF

How much energy is stored in a 3 μF capacitor charged to 6 V?

• 18 μJ

• 27 μJ

• 54 μJ

• 108 μJ

Which of the following is the best use of capacitor in our daily life?

• used as switches in a digital circuit

• used in television systems as phase detectors

• used in a heater and many more heating appliances

• used to measure fuel levels and air humidity as sensors

Which of the following describes a parallel connection of capacitors?

• The total charge is equal to the individual charges.

• Total voltage is equal to the sum of the voltage drop in each capacitor.

• The equivalent capacitance is equal to the sum of the individual capacitance.

• The reciprocal of the equivalent capacitance is equal to the sum of the reciprocal individual capacitance.

What is the role of dielectric in a capacitor?

• to decrease the capacitance

• to increase the electric field

• to avoid touching two parallel plates

• to have a conducting material between the two parallel plates

How is the capacitance affected when inserted a dielectric material in a capacitor?

• The capacitance increases.

• The capacitance decreases.

• The capacitance remains the same.

• The capacitance increases and decreases.