Exam 19: Electric Charges, Forces, and Fields

An electron traveling along the +x-axis enters an electric field that is directed vertically down, i.e., along the negative y-axis. What will be the direction of the electric force acting on the electron after entering the electric field?

FIGURE 19-6 -Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in Figure 19-6. Which of the arrows shown represents the net force acting on the point charge with a charge +Q?

The charge on the proton is the same as

A force of 6.0 N acts on a charge of 3.0 μC when it is placed in a uniform electric field. What is the magnitude of this electric field?

The Coulomb force between two charges can be attractive or repulsive.

Three identical charges of 3.0 μC are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts on any one of the charges?

Three 3.0 μC charges are at the three corners of an square of side 0.50 m. The last corner is occupied by a -3.0 μC charge. Find the electric field at the center of the square.

Four equal charges are located at the corners of a square of side d. If the magnitude of each charge is doubled, then what happens to the resultant force on each charge?

By what method will a positively charged rod produce a negative charge on a conducting sphere that is placed on an insulating surface?

A conductor is placed in an electric field under electrostatic conditions. Which of the following statements is correct for this situation?

FIGURE 19-9 -Three equal point charges are placed at three of the corners of a square of side d as shown in Figure 19-9. Which of the arrows shown represents the direction of the net electric field at the center of the square?

A positive charge placed in an electric field experiences a force in the direction of the field.

A piece of plastic has a net charge of +2.00 μC. How many more protons than electrons does this piece of plastic have?

FIGURE 19-7 -Three equal point charges are placed at the corners of a square of side d as shown in Figure 19-7. Which of the arrows shown represents the direction of the net electric field at the center of the square?

Q₁ = 6.0 nC is at (0.30 m, 0); Q₂ = -1.0 nC is at (0, 0.10 m); Q₃ = 5.0 nC is at (0, 0). What is the direction of the net force on the 5.0 nC charge?

Two equal charges of magnitude +1 C are separated by a distance of 1 km. What is the force acting between these two charges?

FIGURE 19-14 -Two point charges of magnitude + 7.00 μC and - 9.00 μC are placed along the x-axis at x = 0 cm and x = 40.0 cm, respectively. Where must a third charge, q, be placed along the x-axis so that it does not experience any net force because of the other two charges?

A metal sphere of radius 10 cm carries a charge of +2.0 μC. What is the magnitude of the electric field 5.0 cm from the sphere's surface?

How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

Two point charges of + 5.00 μC and + 8.00 μC are placed inside a cube of edge length 0.100 m. The net electric flux due to these charges is given by