Physics 014 Lecture 1. Chapter 21 Electric Charge. Dr. Mengs H. Weldegaber. Office hours : Thirkield Hall, Room 215, MWF 12:00-1:00pm (or by appointment) Phone : (202) 806-6257 Email : mengshw @gmail.com My Research :
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Chapter 21 Electric Charge
Office hours: Thirkield Hall, Room 215, MWF 12:00-1:00pm (or by appointment)
Phone: (202) 806-6257
(1736-1806)Force between pairs of point charges: Coulomb’s law
Coulomb’s law -- the force between point charges:
How do we do charge an object? Usually, moving charges from one surface to another by adhesion (helped by friction), or by contact with other charged objects.
If a conductor, the whole electron sea redistributes itself.
If an insulator, the electrons stay where they are put.How to charge an object
(very hard rubber)
Multiple Forces: If multiple electrostatic forces act on a particle, the net force is the vector sum (not scalar sum) of the individual forces.
Shell Theories: There are two shell theories for electrostatic force
Answer: (a) left towards the electron
(b) left away from the other proton
Example 3. Determine the speed of the electron in orbit about the nuclear proton at a radius of 5.29x10-11 m, assuming the orbit to be circular [The Bohr model of the hydrogen atom]?