1. A positive charge +q is released near a positive fixed charge +Q. As q moves

Question

1. A positive charge +q is released near a positive fixed charge +Q. As q moves away from Q, describe the behavior of its trajectory, velocity and acceleration.

2. Two parallel plates have charges of equal magnitude but opposite sign. What change could be made to increase the field strength between the plates?

3. A dipole is held motionless in a uniform electric field. Describe what happens with the dipole when it is released.

4. Explain the concept of electric field. Explain how you can construct an electric field diagram.

5. Discuss conservation of energy in charge interactions. Example: A proton has a speed of 3.5 x 105 m/s at a point where the electrical potential is 600 V. It moves through a point where the electric potential is 1000 V. What is its speed at this second point?

6. Explain the connection between electric field and potential.

Explanation / Answer

Electric potential is more commonly known as voltage. The potential at a point a distance r from a charge Q is given by:V = k Q / rPotential plays the same role for charge that pressure does for fluids. If there is a pressure difference between two ends of a pipe filled with fluid, the fluid will flow from the high pressure end towards the lower pressure end. Charges respond to differences in potential in a similar way.Electric potential is a measure of the potential energy per unit charge. If you know the potential at a point, and you then place a charge at that point, the potential energy associated with that charge in that potential is simply the charge multiplied by the potential. Electric potential, like potential energy, is a scalar, not a vector.connection between potential and potential energy: V = PE / qEquipotential lines are connected lines of the same potential. These often appear on field line diagrams. Equipotential lines are always perpendicular to field lines, and therefore perpendicular to the force experienced by a charge in the field. If a charge moves along an equipotential line, no work is done; if a charge moves between equipotential lines, work is done.Field lines and equipotential lines for a point charge, and for a constant field between two charged plates

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