20-2 Coulomb’s Law. q 1 q 2. F e = k c. r 2. 20-2 Coulomb’s Law. 1780’s Charles Coulomb was experimenting to find how charges create forces The force depends on Charges Distance He found this relationship. k c = Coulomb’s Constant k c = 8.99x10 9 Nm 2 /C 2. 20-2 Coulomb’s Law.
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The elementary charge of both protons and electrons are the same. One is + and one is -
q = 1.60x10-19 C
This is the smallest possible charge. When a particle is charged, it is always a multiple of this number.
(It is QUANTIZED)
Conductors – any material that allows charges to flow through it easily.
Insulators – a material that does not allow charges to move.
Both can be charged. It is the movement of charges that makes them different.
Charging by Conduction
Objects touch and transfer charges. The object will acquire the same charge as the original charge.
Charging by Induction
Objects do not touch. The object is grounded while a charge is brought close. The object will acquire the opposite charge.