Electric Charges And Fields Flashcards
What is the unit of electric charge?
Coulomb (C)
True or False: Like charges repel each other.
True
What is the fundamental charge of an electron?
-1.6 x 10^-19 coulombs
Fill in the blank: The force between two point charges is described by _______ Law.
Coulomb’s
What does the electric field (E) represent?
The force per unit charge experienced by a positive test charge.
What is the formula for calculating electric field due to a point charge?
E = k * |Q| / r^2
True or False: Electric field lines point away from positive charges and toward negative charges.
True
What is the value of the electrostatic constant (k)?
8.99 x 10^9 N m^2/C^2
What is the principle of superposition in electric fields?
The total electric field is the vector sum of the electric fields due to individual charges.
Multiple Choice: Which of the following is a property of electric field lines? A) They can cross B) They originate from negative charges C) They indicate the direction of the electric field
C) They indicate the direction of the electric field
What is the electric potential (V) at a distance r from a point charge?
V = k * Q / r
Fill in the blank: An electric field is a vector field that associates a ______ with every point in space.
force
What is the relationship between electric field and electric potential?
The electric field is the negative gradient of the electric potential.
True or False: Conductors allow the free flow of electric charge.
True
What happens to the electric field inside a conductor in electrostatic equilibrium?
It is zero.
Multiple Choice: What is the effect of increasing the distance between two charges on the electric force between them? A) It increases B) It decreases C) It has no effect
B) It decreases
What is the concept of electric flux?
Electric flux is the product of the electric field and the area through which it passes, considering the angle between them.
Fill in the blank: The electric field due to a uniformly charged infinite plane sheet is ______.
constant
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 permittivity of free space (ε₀)?
8.85 x 10^-12 C^2/(N m^2)
True or False: Electric field lines can be used to visualize the strength and direction of an electric field.
True
What is an electric dipole?
A pair of equal and opposite charges separated by a distance.
Fill in the blank: The force between two charges decreases as the distance between them ______.
increases
Multiple Choice: Which of the following describes a non-conductive material? A) Insulator B) Conductor C) Semiconductor
A) Insulator
