Electric Field Intensity Flashcards
(24 cards)
What is the definition of an electric field?
An electric field is a region around a charged object where other charged objects experience a force.
True or False: The direction of an electric field is always from positive to negative charge.
True
What is the unit of electric field intensity?
The unit of electric field intensity is volts per meter (V/m).
Fill in the blank: The electric field intensity (E) at a point in space is defined as the force (F) per unit charge (q) at that point, expressed as E = _____.
F/q
What is the formula for calculating electric field intensity due to a point charge?
E = k * |q| / r^2, where k is Coulomb’s constant, q is the charge, and r is the distance from the charge.
Multiple Choice: Which of the following factors does NOT affect the strength of an electric field?
The color of the charged object.
What does the symbol ‘k’ represent in the electric field formula?
Coulomb’s constant.
True or False: Electric field lines can cross each other.
False
Define electric field intensity in your own words.
Electric field intensity is a measure of the force experienced by a unit positive charge placed in an electric field.
What is the relationship between electric field and electric potential?
The electric field is the negative gradient of the electric potential.
Fill in the blank: The electric field inside a conductor in electrostatic equilibrium is _____.
zero
Multiple Choice: Which of the following best describes an equipotential surface?
A surface on which the electric potential is constant.
What is the electric field due to a uniformly charged infinite plane sheet?
The electric field is constant and given by E = σ / (2ε₀), where σ is the surface charge density and ε₀ is the permittivity of free space.
True or False: Electric fields can exist in a vacuum.
True
What is the principle of superposition in the context of electric fields?
The total electric field created by multiple charges is the vector sum of the electric fields produced by each charge individually.
Fill in the blank: The electric field around a positive point charge radiates _____ from the charge.
outward
What happens to the electric field intensity as you move away from a point charge?
The electric field intensity decreases with the square of the distance from the charge.
Multiple Choice: The electric field lines point away from which type of charge?
Positive charge.
Define the term ‘electric flux’.
Electric flux is the measure of the number of electric field lines passing through a given area.
What is Gauss’s Law in relation to electric fields?
Gauss’s Law states that the electric flux through a closed surface is proportional to the enclosed electric charge.
True or False: The electric field intensity is a scalar quantity.
False
What is the electric field intensity around a dipole at a point along its axial line?
E = (1/(4πε₀)) * (2p / r^3), where p is the dipole moment and r is the distance from the center of the dipole.
Fill in the blank: The electric field due to a dipole decreases with the cube of the distance, expressed as E ∝ 1/r^____.
3
What is the significance of the permittivity of free space (ε₀) in electric fields?
Permittivity of free space is a constant that affects the strength of the electric field in a vacuum.
