Electric
Fields
Charges
basic
property of matter (like mass)
Early (B.C.) experiments
–
two types
Named by B. Franklin:
+
and
−
Electrostatics
–
study of charges (nearly) at rest
?, ?, ?
−
–
‘point particles’
? ≪ ?
Symbol:
?, 𝑄
Unit:
C = coulomb
Properties of Charges
“
Opposites attract”
?
??𝑗???
= ?
+
+ ?
−
= +, −, 0
Conservation of charge
Quantized
fundamental unit of charge:
? = 1.60 × 10
−19
𝐶
?
????????
= −?; ?
??????
= +?; ?
???????
= 0
