Physics Quiz: Capacitance and Dielectrics

What is capacitance defined as?

• The product of charge and potential difference

• The difference between charge and potential difference

• The sum of charge and potential difference

• The ratio of charge stored on each conductor to the potential difference between them

What is the SI unit of capacitance?

• Volt

• Farad

• Ohm

• Henry

What is the formula for the energy stored in a capacitor?

• U = C / V

• U = C * V

• U = C + V

• U = (1/2) * C * V^2

What effect does a dielectric have on the capacitance of a capacitor?

• Decreases capacitance

• No effect on capacitance

• Increases capacitance

• Reduces electric field

What is the formula for the capacitance of a parallel-plate capacitor with a dielectric?

• C = κ * ε₀ * A / d

• C = A / d

• C = ε₀ * A / d

• C = κ * A / d

In a series combination of capacitors, what happens to the overall capacitance?

• Reduces

• Remains the same

• Increases

• Becomes zero

What is the torque experienced by an electric dipole in an external electric field?

• τ = p + E

• τ = pE cos θ

• τ = pE sin θ

• τ = p - E

What is the potential energy of a dipole in an electric field when it is in stable equilibrium?

• Maximum

• Minimum

• Zero

• Depends on the dipole moment

What is the energy density formula for an electric field?

• u = ε₀ / E²

• u = (1/2) * ε₀ * E²

• u = ε₀ * E²

• u = E / ε₀

What is the total energy stored in a volume due to an electric field?

• U = ε₀ * ∫ E² dV

• U = (1/2) * ε₀ * ∫ E² dV

• U = (1/2) * ε₀ * E²

• U = ε₀ * E²