G12 - ADV- Capacitor

The simplest form of capacitor is made out of

• three metal plates and between the plates is an insulating material

• two metal plates and between the plates is a dielectric material

• one metal plate and a dielectric material

The energy of a charged capacitor is given by the expression (q= charge on the conductor and C = its capacity)

• 2qC

A parallel plate capacitor is connected to a cell of constant emf. The plates are moved further apart without disconnecting the cell. What happens to the capacitance and voltage across the plates?

• capacitance increases; voltage remains constant
• capacitance remains constant; voltage decreases
• capacitance decreases; voltage increases
• capcitance decreases; voltage remains constant

Capacitor C₁ and C₂ are connected in parallel. The equivalent capacitance is given by: 

• C₁ + C₂
• 1/(C₁ + C₂) 
• C₁C₂/(C₁ + C₂) 
• (C₁ + C₂)/C₁C₂

A parallel-plate capacitor has a plate area of 0.2 m² and a plate separation of 0.1 mm. To obtain an electric field of 2.0 ´ 10⁶ V/m between the plates, the magnitude of the charge on each plate should be:

• 3.5 ´ 10^-6 C
• 7.1 ´ 10^-6 C 
• 1.4 ´ 10^-5 C
• 1.8 ´ 10^-5 C

If both the plate area and the plate separation of a parallel-plate capacitor are doubled, the capacitance is: 

• doubled
• halved
• unchanged 
• one-fourth the original 

What is a Parallel circuit? 

• Has only one path 
• Has more than one path 
• Allows energy to travel through easily 
• Has only one light bulb

Capacitor is a device used to store ----

• electric charge and power

• electric charge and electric energy

• electric energy and power

• power and potential

SI unit of capacitance is

• Coulomb per newton

• Coulomb per volt

• volt per meter

• .newton

Unit of capacitance is___________

• Volt
• Ampere
• Farad
• Ohms