Define Coulomb's law .

The force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

State whether the electric force is attractive or repulsive for (a) two like charges and (b) two opposite charges.

Two like charges: the product Q 1 Q 2 is positive, giving a repulsive force Two opposite charges: the product Q 1 Q 2 is negative, giving an attractive force

What assumption allows a uniformly charged sphere to be treated as a point charge when calculating the force on it?

For a point outside the sphere, the charge may be considered to be a point charge concentrated at the sphere's centre .

For a point outside a spherical conductor, the charge of the sphere may be considered to be a .......... at its centre.

For a point outside a spherical conductor, the charge of the sphere may be considered to be a point charge at its centre.

True or False? Coulomb's law can be used to calculate the force between charges distributed on an irregularly shaped object.

False. Coulomb's law only applies to point charges, or to uniformly charged spheres whose size is much smaller than their separation.

A LevelPhysicsCambridge (CIE)Flashcards18. Electric FieldsElectric Force Between Point Charges

Electric Force Between Point Charges (Cambridge (CIE) A Level Physics): Flashcards

Exam code: 9702

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FrontElectric Force Between Two Point Charges
Define Coulomb's law.
FrontElectric Force Between Two Point Charges
State whether the electric force is attractive or repulsive for (a) two like charges and (b) two opposite charges.
BackElectric Force Between Two Point Charges
Two like charges: the product Q₁Q₂ is positive, giving a repulsive force
Two opposite charges: the product Q₁Q₂ is negative, giving an attractive force

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Cards in this collection (7)

Define Coulomb's law.
The force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Write the equation for Coulomb's law in terms of the permittivity of free space ε₀.
$F = \frac{Q_{1} Q_{2}}{4 π ϵ_{0} r^{2}}$
State whether the electric force is attractive or repulsive for (a) two like charges and (b) two opposite charges.
- Two like charges: the product Q₁Q₂ is positive, giving a repulsive force
- Two opposite charges: the product Q₁Q₂ is negative, giving an attractive force
What assumption allows a uniformly charged sphere to be treated as a point charge when calculating the force on it?
For a point outside the sphere, the charge may be considered to be a point charge concentrated at the sphere's centre.
For a point outside a spherical conductor, the charge of the sphere may be considered to be a .......... at its centre.
For a point outside a spherical conductor, the charge of the sphere may be considered to be a point charge at its centre.
True or False?
Coulomb's law can be used to calculate the force between charges distributed on an irregularly shaped object.
False.
Coulomb's law only applies to point charges, or to uniformly charged spheres whose size is much smaller than their separation.
Coulomb's law can be written as $F = k \frac{Q_{1} Q_{2}}{r^{2}}$ . What is the Coulomb constant k in terms of ε₀?
$k = \frac{1}{4 π ϵ_{0}}$

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