13. Electric Field Flashcards
What is electric field strength?
Electric field strength at a point in an electric field is the electric force exerted per unit positive charge acting on a small stationary charge placed at the point.
What is the formula of electric field strength?
E = F / q
E is the electric field strength ( NC ⁻¹ or Vm ⁻¹ )
F is the electric force (N)
q is the numerical value of the charge
What is the formula of force between two point charges?
F = Qq / 4∏ε₀r
F is the force between two point charges
Q is the numerical charge of the 1st charge
q is the numerical charge of the second charge
𝜀₀ is the permittivity of free space, 8.85 x 10 ⁻¹² Fm ⁻¹
r is the distance between point charges (m)
What is electric potential energy?
Electric potential energy of a charge at a point in an electric field is defined as the work done by an external force in moving the charge form infinity to the point in the electric field (without the change in kinetic energy)
What is electric potential?
Electric potential at a point in an electric field is defined as the work done per unit positive charge in moving a small test charge from infinity to that point (without the change in its kinetic energy)
What is the formula for electric potential energy?
U = qV
U is the electric potential energy (J)
q is the numerical value of the charge
V is the electric potential ( J C ⁻¹ )
What is the formula for electric potential?
V = U/q
U is the electric potential energy (J)
q is the numerical value of the charge
V is the electric potential ( J C ⁻¹ )
What is an electric field?
An electric field is a region of space where a stationary charge experience a force. The direction of the electric field is the direction of the force on a positive charge.
What are electric field lines?
Electric field lines are lines that show the direction of the force acting on a stationary. positive point charge in the field.
What is Coulomb’s Law?
Coulomb’s law states that the force between two point charges Q1 and Q2 is proportional to the product of the charges and inversely proportional to the square of their separation.
