Activity B: The Effect of Distance on Electrostatic Force
Claim
- Distance and Electrostatic Force: The force decreases as the distance increases.
Evidence
As per the observations made when moving object A and measuring the electrostatic forces, it was noted that as the distance between the two charges, qA (10.0 × 10⁻⁴ C) and qB (1.0 × 10⁻⁴ C), increased, the magnitude of the force between them decreased.
Reasoning
This finding is consistent with Coulomb's Law, which states that the magnitude of the electrostatic force \( F \) between two point charges is inversely proportional to the square of the distance \( r \) between them. Mathematically, it can be expressed as:
\[ F = k \cdot \frac{|qA \cdot qB|}{r^2} \]
Where \( k \) is Coulomb's constant. As \( r \) increases, the force \( F \) decreases, demonstrating that greater separation between charges results in a weaker electrostatic force.
Claim
- Charge and Electrostatic Force: The force increases as the magnitude of the charge increases.
Evidence
Given the values assigned to the charges (qA = 10.0 × 10⁻⁴ C and qB = 1.0 × 10⁻⁴ C), the resulting electrostatic force was strong owing to the combination of the magnitudes of the charges. When the charge magnitudes were assessed while keeping the distance constant, an increase in either charge resulted in a noticeable increase in force.
Reasoning
This supports the understanding from Coulomb's Law, which illustrates that the electrostatic force is directly proportional to the product of the magnitudes of the charges. Using the same formula from above:
\[ F = k \cdot \frac{|qA \cdot qB|}{r^2} \]
If we increase \( |qA| \) or \( |qB| \) while keeping \( r \) constant, the overall force \( F \) increases. This demonstrates a direct relationship between the magnitudes of the charges and the strength of the electrostatic force acting between them.