# Electric Field / Electric Potentiel / Electric Current

1) A 5.0-C charge is 10 m from a small test charge. What is the magnitude of the electric field at the location of the test charge?

2)Two parallel plates, separated by 0.20 m, are connected to a 12-V battery. An electron released from rest at a location 0.10 m from the negative plate. When theelectron arrives at a distance 0.050 m from the positive plate, how much kinetic energy does the electron gain?

3)A 4.0-g object carries a charge of 20 µC. The object is accelerated from rest through a potential difference, and afterward the ball is moving at 2.0 m/s. What isthe magnitude of the potential difference?

4)A point charge of +Q is placed at the center of a square. When a second point charge of -Q is placed at one of the square's corners, it is observed that anelectrostatic force of 2.0 N acts on the positive charge at the square's center. Now, identical charges of -Q are placed at the other three corners of the square. Whatis the magnitude of the net electrostatic force acting on the positive charge at the center of the square?

5)The absolute potential at the center of a square is 3.0 V when a charge of +Q is located at one of the square's corners. What is the absolute potential at thesquare's center when a second charge of -Q is placed at one of the remaining corners?

6)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 electrostaticforce which acts on any one of the charges?

7)Three point charges are placed on the x-axis. A charge of +2.0 µC is placed at the origin, -2.0 µC to the right at x = 50 cm, and +4.0 µC at the 100 cm mark. Whatare the magnitude and direction of the electrostatic force which acts on the charge at the origin?
Answer 0.14 N right or 0.072 N left or 0.14 N left or 0.072 N right.

8) 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?

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