Topic 2: Capacitor and dielectric 1st hour

1. Capacitance is defined as the ratio of the _____ on either plate to the potential difference between them.

• charge

• voltage

• current

• electron

2. 1 _____ is defined as the charge of 1 coulomb stored on each of the conducting plates as a result of a potential difference of 1 volt between the two plates.

• Coulomb

• Farad

• Joule

• Newton

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

• C1C2/(C1 + C2)

• C1 + C2

• (C1 + C2)/C1C2

• 1/(C1 + C2)

4. When a capacitor stores charge, it also stores _______

• energy

• power

• voltage

• current

5. Capacitors can undergoes two different process mainly known as ________.

• series and parallel

• charging and discharging

• positive and negative plate

• conducting and non-conducting material

6. The quantity RC that appears in the exponent for all equations in the charging and discharging process is called _______.

• time lapse

• time instant

• time constant

• time taken

7.     When two or more capacitors are connected in series to a battery,

• the total voltage across the combination is the algebraic sum of the voltages across the

• each capacitor carries the same amount of charge.

• the equivalent capacitance of the combination is less than the capacitance of any of each capacitor

• all of the given answers

8.     Three identical capacitors are connected in series to a battery. If a total charge of Q flows from the battery, how much charge does each capacitor carry?

• 3Q

• Q

• Q/3

• Q/9

9.  Which of the following statements is FALSE  about time constant?

• In the charging process, time constant is time required for the current drop to 37% from maximum current.

• In the discharging process, time constant is time required for the voltage on the capacitor to decrease to 37% of its initial value.

• In the discharging process, time constant is time required for the charge on the capacitor to decrease to 37% of its initial value.

• In the charging process, time constant is time required for the capacitor to reach 37% of its maximum charge.

10.  Which of the following graphs best shows the potential difference across a capacitor discharging through a resistor?

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