Chapter 11- Electrical Interactions and the Law of Conservation of Energy

When we deal with 2 point charges (point P), the electric field surround the point charged is _________

Non-uniform

When should we use the Law of Conservation of Energy?

To consider the varying speeds and distances objects travel. As long as energy is CONSERVED in an isolated system

Equation of the Law of Conservation of Energy

Ei = Ef

Epi + Eki = Epf + Ekf

Example

Point Charges

• Use CONSERVATION OF ENERGY

• The electric field is NON-UNIFORM

• Equation (E=kq/r²)

Capacitor (2 parallel plates)

• Use CONS. OF ENERGY, KINEMATICS, DYNAMICS (F = ma, where F is Fe)

• Electric field is UNIFORM

• Equation (E=v/d)