Exam 20: Electric Potential and Electric Potential Energy

A dielectric material such as paper is placed between the plates of a capacitor holding a fixed charge. What happens to the electric field between the plates?

A -4.0-μC charge is situated at the origin of an xy-coordinate system. Another -4.0 μC charge is at y = 4.0 m. What is the electric potential at a point x = 3.0 m due to these two charges?

FIGURE 20-14 -The equipotential surfaces between two spherical conductors are shown in Figure 20-14, with the value of the potential marked for each line. What is the potential difference between points A and G?

FIGURE 20-1 -Two electric charges each equal to -Q, are separated by a distance d. If you make a graph of the electric potential as a function of the distance along the line connecting the two charges, the point exactly midway between the two charges would

If you were a parallel plate capacitor manufacturer, state three ways you might make larger valued capacitors.

FIGURE 20-8 -Two charges of magnitude 6.0 μC, but opposite signs, are placed at the corners of the base of an equilateral triangle, as shown in Figure 20-8. What is the electric potential at the vertex, P, of the triangle due to these charges?

Electric potential is a scalar quantity.

Which of the following expression(s) represents the electrical energy stored by a capacitor?

A 6.00-μF parallel plate capacitor has a charge of + 40.0 μC and - 40.0 μC on each plate, respectively. The potential energy stored in this capacitor is:

FIGURE 20-2 -The equipotential surfaces between two spherical conductors are shown in Figure 20-2, with the value of the potential marked for each line. What is the direction of the electric field at point F?

Two equal point charges of magnitude 4.0 μC are situated along the x-axis at x₁ = -2.0 m and x₂ = -2.0 m. What is the electric potential energy of this system of charges?

FIGURE 20-5 -Four equal point charges of magnitude 6.00 μC and of varying signs are placed at the corners of a square 2.00 m on each side, as shown in Figure 20-5. What is the electric potential at the center of this square due to these charges?

The magnitude of the charge on each plate of a parallel plate capacitor is 4 μC and the potential difference between the plates is 80 V. What is the capacitance of this capacitor?

In the expression for the definition of capacitance C = Q/V, Q is the total charge on the plates of a capacitor.

A capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q. If the separation between the plates is doubled, the potential difference between the plates will

An 800 V/m electric field is directed along the +x-axis. If the potential at x = 0 m is 2000 V, what is the potential at x = 2 m?

After being charged from a battery, the plates of a parallel plate capacitor are moved closer together. When they are half as far apart as originally, by how much does the stored energy change?

FIGURE 20-1 -Two electric charges each equal to +Q, are separated by a distance d. If you make a graph of the electric potential as a function of the distance along the line connecting the two charges, the point exactly midway between the two charges would

FIGURE 20-1 -Two electric charges +Q and -Q, are separated by a distance d. If you make a graph of the electric potential as a function of the distance along the line connecting the two charges, the point exactly midway between the two charges would

FIGURE 20-4 -Four equal point charges of magnitude 6.00 μC are placed at the corners of a square 2.00 m on each side, as shown in Figure 20-4. What is the electric potential of these charges at the center of this square?