What is Coulomb's law?
Coulomb's law states that the force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between their centres.
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What is the formula linking force (F), two point charges (Q1 and Q2), perimittivity of free space (ϵ0), and the distance between the centres of the point charges (r)?
F = force (N)
Q1 = charge 1 (C)
Q2 = charge 2 (C)
ϵ0 = permittivity of free space = 8.85 x 10-12 F m-1
r = distance (m)
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What does the 'r' in Coulomb's law formula represent?
'r' in Coulomb's law formula represents the distance between the two charges.
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How does the force between two charges change if the distance between them is doubled?
If the distance between two charges is doubled, the force between them is reduced to a quarter.
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How does the force between two charges change if the magnitude of one of the charges is tripled?
If the magnitude of one of the charges is tripled, the force between the two charges is also tripled.
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What happens to the force if both charges are positive or both are negative?
If both charges are positive or both are negative, the force is repulsive.
Like charges repel each other.
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What happens to the force if one charge is positive and the other is negative?
If one charge is positive and the other is negative, the force is attractive.
Opposite charges attract each other.
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