Capacitors (1-3)

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)

• $\frac{Q^2}{2C}$

• $\frac{Q^2}{C}$

• $\frac{Q^{ }}{2C^2}$

•  $2QC$  

Can a metal be used as a medium for dielectric

• Depends on its shape

• Depends on dielectric

• YES

• NO

Change Q on a capacitor varies with voltage V . The area of triangle OAB represents

• Capacitance

• Capacitive reactance

• Magnetic field between the plates

• Energy stored in the capacitor

A capacitor is charged to 200 volt it has 0.1 coulomb charge. When it is discharged, energy will be

• 1 J

• 4 J

• 20 J

• 10 J

What is the voltage across   the plates of the capacitor if  the capacitance is 10 uF and the Charge stored is  30 uC?

• 0.333 V
• 3 V
• 300 V

------------------------ is created out of two metal plates and an insulating material called a dielectric.

• An inductor
• A capacitor
• A fixed resistor
• A variable resistor

In the capacitor, the dielectric can be made out of all sorts of ---------- materials and the plates are made of a -------------- material.

• conductive, insulating 
• conductive, conductive
• insulating, conductive
• insulating, insulating

With respect to the capacitor, which relationship is true? •

• C = Q×V

• V = C×Q

• V = Q/C

• Q = C/V

Capacitor is a device use to store energy. Therefore a solar cell is a type of capacitor.

• True

• False