View
10
Download
0
Category
Preview:
Citation preview
Physics ���Chapter 16: Electric Forces and
Fields ���Chapter 17: Electric Energy and
Current
Section 16.3 Electric Fields
Electric Fields
--Electric forces are field forces, capable of!acting at a distance through space.!
--An electric field is a region around a charged!object where an electric force on a test charge!can be detected.!
--The magnitude and direction of the electric!field is defined as the electric field lines on a!unit positive charge.!
--The field lines will point away from an object!with a positive charge and towards an object!with a negative charge.!
http://qbx6.ltu.edu/s_schneider/physlets/main/efield.shtml
Electric Field Strength --The strength of the electric field can be!
calculated:!
--This equation gives the electric field!strength or the force per unit charge.!
€
E = Fc
qo
Since:!
And:! ! qo = q1 = 1 e!
€
Fe = Kc q1q2
R2
€
E = Kcq
R2Then:!
€
E = Kcq
R2
Ex: What is the electric field strength around an object whose charge is +2.5 x 10-10 C at a distance of 0.30 m?!
€
E = (8.9875 x 109 N *m2
C2 )( +2.5 x 10-10 C(0.30 m)2 )
€
E = 24.96 NC
Recommended