Electric Charge: A fundamental property of matter that causes it to experience a force when in an electromagnetic field; measured in coulombs (C). It exists in two types: positive and negative.
Protons and Electrons: Subatomic particles carrying positive and negative charges, respectively. Protons are located in the nucleus, while electrons orbit the nucleus.
Conservation of Charge: The principle that electric charge cannot be created or destroyed in an isolated system; total charge remains constant.
Coulomb’s Law: Describes the force between two point charges:
[ F = k \frac{|q_1 q_2|}{r^2} ]
where ( F ) is the force, ( q_1, q_2 ) are charges, ( r ) is the distance, and ( k ) is Coulomb’s constant.
Charge Quantization: Electric charge occurs in discrete amounts, with the elementary charge ( e \approx 1.6 \times 10^{-19} ) C being the smallest unit of charge.
Electric Conductors and Insulators: Materials that allow or resist the flow of electric charge. Conductors (like copper) have free electrons; insulators (like rubber) do not.
1. What is electric charge?
2. What is Coulomb’s Law, as described in the revision sheet, and what does the constant 'k' represent in the formula?
3. What is the approximate value of Coulomb’s constant (k) used in Coulomb’s Law?
Electric charge — measured in?
Coulombs (C).
Electric charge — definition?
Property causing electromagnetic forces, measured in coulombs.
Coulomb’s Law — describes?
Force between two point charges.
Protons vs electrons — difference?
Protons positive, electrons negative charges.
Electric current — unit?
Ampere (A).
Conservation of charge — principle?
Charge cannot be created or destroyed.
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