Capacitor Quiz

The capacitance of a spherical capacitor depends on

• Area of outer sphere

• Distance between centers

• Radii of inner and outer spheres

• Thickness of dielectric

The electric field inside a cylindrical capacitor is

• Uniform

• Radial

• Circular

• Constant

The capacitance of a parallel plate capacitor increases with

• Decreasing plate area

• Increasing plate separation

• Decreasing dielectric constant

• Increasing plate area

The unit of capacitance is

• Henry

• Coulomb

• Farad

• Ampere

Capacitance of a parallel plate capacitor with dielectric is

• ε₀A/d

• Kε₀A/d

• d/ε₀A

• ε₀/Kd

Inserting a dielectric into a charged capacitor

• Increases voltage

• Decreases charge

• Increases capacitance

• Decreases capacitance

The force between plates of a charged parallel plate capacitor is

• Zero

• Repulsive

• Attractive

• Infinite

The force of attraction between capacitor plates is given by

• QV

• ½CV²

• ε₀AV²/2d²

• Q²/2C

The dielectric constant of vacuum is

• 0

• 1

• 2

• Infinite

The main function of a guard ring in a capacitor is to

• Store extra charge

• Increase area

• Prevent edge effects and leakage

• Decrease voltage