Ecf Flashcards
What is the unit of electric charge?
Coulomb (C)
True or False: Like charges repel each other.
True
What is the principle of conservation of charge?
The total electric charge in an isolated system remains constant.
Fill in the blank: The force between two point charges is given by _____ law.
Coulomb’s
What is the formula for Coulomb’s law?
F = k * |q1 * q2| / r^2
What does ‘k’ represent in Coulomb’s law?
Coulomb’s constant (approximately 8.99 x 10^9 N m²/C²)
Define electric field.
The electric field is a region around a charged particle where other charged particles experience a force.
What is the unit of electric field?
Newton per Coulomb (N/C)
How is the electric field (E) related to force (F) and charge (q)?
E = F/q
What is the electric field due to a point charge?
E = k * |q| / r^2
True or False: The direction of the electric field is the direction of the force experienced by a positive charge.
True
What is the formula for the electric potential (V) due to a point charge?
V = k * q / r
Define electric potential energy.
The work done to move a charge in an electric field.
What is the relationship between electric potential and electric field?
E = -dV/dr
Fill in the blank: The area under the electric field vs. distance graph represents _____ potential.
electric
What is a conductor in electrostatics?
A material that allows electric charges to flow freely.
What happens to excess charge on a conductor?
It resides on the surface.
Define dielectric.
An insulating material that can be polarized by an electric field.
What is the effect of a dielectric on capacitance?
It increases the capacitance.
What is the formula for capacitance (C)?
C = Q/V
True or False: Capacitors store electric charge.
True
What is the unit of capacitance?
Farad (F)
What is the formula to calculate the energy stored in a capacitor?
U = 1/2 C V^2
What is the relationship between electric field and potential difference in a uniform field?
E = V/d
What is Gauss’s law?
The electric flux through a closed surface is equal to the charge enclosed divided by the permittivity of free space.
What is the mathematical expression of Gauss’s law?
Φ_E = Q_enc / ε_0
What does ε_0 represent in Gauss’s law?
The permittivity of free space.
