Capacitors

In a charged capacitor, the energy resides

• The positive charges

• Both the positive and negative charges

• The field between the plates

• Around the edge of the capacitor plates

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

• $\frac{q^2}{2C}$

• $\frac{q^2}{C}$

• $\frac{q^{ }}{2C^2}$

• 2qC

The capacity of a parallel plate condenser is C . Its capacity when the separation between the plates is halved will be

• 4C

• 2C

• C/2

• C/4

When a dielectric material is introduced between the plates of a charged condenser then electric field between the plates

• Decreases

• Increases

• Remain constant

• First (b) then (a)

Capacitance is measured in___________

• Coulombs

• Farads

• Hz

• Volts

What happens to the charge in a capacitor during the charging process?

• Collects more and more electrons

• Decreases charge over time

• Remains the same

What are the factors that influence capacitance of a capacitor?

• Surface area

• Temperature

• Dielectric

• Length

• Distance between plates

What is a dielectric?

• Two electrons flowing in a circuit

• The two metal plates in a capacitor

• Insulating material between the plates in a capacitor

• Conducting liquid between electrodes in a battery

A 5uF, a 10uF and a 20uF capacitor are connected in PARALLEL to a 6V battery. Calculate the total equivalent capacitance of the circuit?

• 35uF

• 0,35uF

• 2,857uF

• 0,0286uF

A 5uF, a 10uF and a 20uF capacitor are connected in SERIES to a 6V battery. Calculate the total equivalent capacitance of the circuit?

• 35uF

• 0,35uF

• 2,857uF

• 0,0286uF