Electrostatic Flashcards
(27 cards)
What is electrostatics?
The study of electric charges at rest.
True or False: Electrostatic forces can act over a distance without physical contact.
True
Fill in the blank: The unit of electric charge is the __________.
Coulomb
What law describes the force between two charged objects?
Coulomb’s Law
According to Coulomb’s Law, the force between two charges is directly proportional to the product of the charges and inversely proportional to the __________.
square of the distance between them
What is the formula for Coulomb’s Law?
F = k * |q1 * q2| / r^2
What does the symbol ‘k’ represent in Coulomb’s Law?
The electrostatic constant or Coulomb’s constant
Multiple Choice: What is the value of Coulomb’s constant (k)? A) 8.99 x 10^9 N m²/C² B) 6.674 x 10^-11 N m²/kg² C) 9.81 m/s²
A) 8.99 x 10^9 N m²/C²
True or False: Like charges repel each other.
True
True or False: Opposite charges attract each other.
True
What is an electric field?
A region around a charged object where other charges experience a force.
What is the formula for electric field (E) due to a point charge?
E = k * |q| / r^2
Fill in the blank: The electric field is a vector quantity that has both __________ and __________.
magnitude, direction
What is the SI unit for electric field strength?
Volts per meter (V/m)
Multiple Choice: Which of the following materials is a good insulator? A) Copper B) Rubber C) Aluminum
B) Rubber
What is the principle of superposition in electrostatics?
The total electric field is the vector sum of the electric fields due to individual charges.
True or False: An electric dipole consists of two equal and opposite charges separated by a distance.
True
What is the dipole moment (p) formula?
p = q * d
Fill in the blank: The force experienced by a dipole in a uniform electric field is __________.
zero
What effect does a conductor have on an electric field?
It redistributes its charges to cancel the electric field inside the conductor.
What is the purpose of grounding?
To provide a safe path for electric charges to flow into the earth.
Multiple Choice: Which of the following is a method of charging an object? A) Conduction B) Induction C) Friction D) All of the above
D) All of the above
What is the main characteristic of electrostatic equilibrium?
The electric field inside a conductor is zero.
Fill in the blank: The potential energy of a system of charges depends on their __________.
relative positions
