7.1 Stel Coulomb se wet in woorde - NSC Physical Sciences - Question 7 - 2017 - Paper 1
Question 7
7.1 Stel Coulomb se wet in woorde.
7.2 Die grootte van lading Q1 en Q2 is onbekend. Die lad ing op Q1 is positief. Die lading op Q3 is 2 × 10⁻⁶ C en die ondervind ‘... show full transcript
Worked Solution & Example Answer:7.1 Stel Coulomb se wet in woorde - NSC Physical Sciences - Question 7 - 2017 - Paper 1
Step 1
Stel Coulomb se wet in woorde.
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Answer
Coulomb's law states that the magnitude of the electrostatic force between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them.
Step 2
Die grootte van lading Q1 en Q2 is onbekend. Die lading op Q1 is positief.
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Answer
Since Q1 is positive and the net force on Q3 is directed to the left (towards Q1), Q2 must be a negative charge to contribute a force that pulls Q3 positive charge towards it.
Step 3
Bereken die groottes van die onbekende ladings Q1 en Q2.
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Answer
Using Coulomb's law:
F=kr2Q1Q2
Given:
The net force on Q3:
F=0.3N
Distance between Q2 and Q3 is 1 m:
Use the distance for calculation:
F=k12Q3Q2
Where k (Coulomb's constant) can be approximated as 8.99×109Nm2/extC2.
Substituting values, we get:
For Q1:
From the forces:
Fnet=FQ13+FQ23
And for calculations,
0.3=0.012=1(9×10−9C)(Q2)
Hence, we can solve for Q2:
Q2=1.73×10−5C
Q1 can then be calculated similarly depending on the derived equation from the forces.
