Electric Forces. Coulomb’s Law. Group Problems. What is the force (magnitude and direction) on a -10 m C charge located at x = 4 m from a 5 m C charge at the origin? Steps: a. Draw quick sketch (labeled with info)
Steps: a. Draw quick sketch (labeled with info)
b. Decide on relevant idea/theory/equation and make correspondence of variables – what is given, what is unknown – can you solve for unknowns?
c. Do the math – be sure to answer completely and to put units
d. Check answer if at all possible
2. Repeat the previous problem when the 5 mC charge is located at x = 1 m and is replaced with a -5 mC charge.
3. What is the force on a charge Q located at x1 from a charge q located at x2? Try to get a general expression that works for all values of the variables.
E field of point charge
the electric field and net charge inside any conductor after reaching electrostatic equilibrium are zero
the electric field just outside the conducting surface must be perpendicular to the surface.
- Isoelectric focusing