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503-F: Coulombs Law 1: Two charges

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503-F: Coulombs Law 1: Two charges

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$$ F_E = k \frac{q_1 q_2}{d^2} $$

Symbol
Quantity
SI Unit
\( F_E \)
Electrostatic Force
Newtons (N)
\( k \)
Coulomb's Constant = \( 9.0 \cdot 10^9 \frac{\text{N} \cdot \text{m}^2}{\text{C}} \)
\( \frac{\text{N} \cdot \text{m}^2}{\text{C}} \)
\( q_1 \)
Charge 1
Coulombs (C)
\( q_2 \)
Charge 2
Coulombs (C)
\( d \)
Distance between charges
Meters (m)

Attraction and Repulsion

An electrostatic force can be either an attractive charge or a repulsive charge, depending upon the situation. Like charges repel each other, and opposite charges attract.

Charge
Attract or Repel?
Positive and Positive
Repulsive
Negative and Negative
Repulsive
Positive and Negative
Attractive

Useful Constants

Symbol
Name
Value
Explanation
\( e \)
Elementary Charge
\( 1.602 \cdot 10^{-19} \text{ Coulombs}\)
The charge of a single proton or electron.
angstrom
\( 1 \cdot 10^{-10} \text{ meters} \)
A frequently used distance unit for the insides of atoms.

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