Pre-Lecture Quiz #3 – Flashcards

Which of the following statements are true? 1. A capacitor consists of a single sheet of a conducting material placed in contact with an insulating material. 2. The capacitance of a capacitor depends upon its structure. 3. A capacitor is a device that stores electric potential energy and electric charge. 4. The electric field between the plates of a parallel-plate capacitor is uniform.

Which of the following will increase the capacitance of a parallel-plate capacitor? 1. Increasing the separation between the plates will increase the capacitance of a parallel-plate capacitor. 2. Decreasing the separation between the plates will increase the capacitance of a parallel-plate capacitor. 3. Decreasing the area of the plates will increase the capacitance of a parallel-plate capacitor. 4. Increasing the area of the plates will increase the capacitance of a parallel-plate capacitor.

The plates of a parallel-plate capacitor are maintained with a constant voltage by a battery as they are pulled apart. How is the strength of the electric field affected during this process? 1. The strength of the electric field decreases during this process. 2. The electric field between the plates becomes zero. 3. The electric field between the plates becomes infinite. 4. The strength of the electric field remains constant. 5. The strength of the electric field increases during this process.

Which of the following statements are true? 1. Dielectrics allow electric charge to flow as easily as they do in air. 2. The insertion of a dielectric material between the two conductors in a capacitor allows the plates of the capacitor to be placed closer together without touching. 3. After the space between the two conductors in a capacitor is filled with a dielectric material, the capacitance of the capacitor decreases. 4. The insertion of a dielectric material between the two conductors in a capacitor allows a higher voltage to be applied to the capacitor.

If a dielectric material, such as Teflon®, is placed between the plates of a parallel-plate capacitor without altering the structure of the capacitor, how is the capacitance affected? 1. The capacitance becomes infinite after the insertion of the Teflon®. 2. The capacitance becomes zero after the insertion of the Teflon®. 3. The capacitance is not altered, because the structure remains unchanged. 4. The capacitance increases because of the insertion of the Teflon®. 5. The capacitance decreases because of the insertion of the Teflon®.