#2 Coulomb's force | Properties | Complete concepts | Class 11 NEB Physics
Physics in Depth・6 minutes read
One coulomb charge equals 6.25 billion elementary charges, with the force of attraction or repulsion between charges determined by their magnitudes and distance between them based on the formula F ∝ q1q2 / r^2. The electrostatic force constant, k, is 8.99 x 10^9 Nm^2/C^2, significantly stronger than the gravitational force between particles at small distances.
Insights
- One coulomb charge is composed of 6.25 billion elementary charges, each being 1.6 x 10^-19 coulombs, highlighting the fundamental nature of charge quantization in electrical interactions.
- The electrostatic force between particles is significantly stronger than gravitational force at small distances, with the force proportional to the product of charges and inversely proportional to the square of the distance between them, emphasizing the crucial role of electrostatics in particle interactions.
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Recent questions
What is the relationship between charges and force?
The force between charges is directly proportional to their magnitudes and inversely proportional to the square of the distance between them, following the formula F ∝ q1q2 / r^2.
How is the electrostatic force constant defined?
The electrostatic force constant, k, is 8.99 x 10^9 Nm^2/C^2, representing the force between two 1kg masses placed 1 meter apart in a vacuum.
What is the strength comparison between electrostatic and gravitational forces?
The electrostatic force between a proton and an electron in a vacuum is approximately 2.28 x 10^39 times stronger than the gravitational force between them, showcasing the dominance of electrostatic forces at small distances.
How many elementary charges are in one coulomb?
One coulomb charge is equivalent to 6.25 billion elementary charges, each being 1.6 x 10^-19 coulombs.
What is the formula for the force between charges?
The force of attraction or repulsion between charges is directly proportional to their magnitudes and inversely proportional to the square of the distance between them, following the formula F ∝ q1q2 / r^2.
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Summary
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Electrostatic Forces: Charge, Magnitude, and Proportionality
- One coulomb charge is equivalent to 6.25 billion elementary charges, each being 1.6 x 10^-19 coulombs.
- The force of attraction or repulsion between charges is directly proportional to their magnitudes and inversely proportional to the square of the distance between them, following the formula F ∝ q1q2 / r^2.
- The electrostatic force constant, k, is 8.99 x 10^9 Nm^2/C^2, representing the force between two 1kg masses placed 1 meter apart in a vacuum.
- The electrostatic force between a proton and an electron in a vacuum is approximately 2.28 x 10^39 times stronger than the gravitational force between them, showcasing the dominance of electrostatic forces at small distances.
