WorksheetsCapacitor
Total questions: 14
Worksheet time: 8mins
Capacitor is a device used to__________
store electrical energy
vary the resistance
store magnetic energy
dissipate energy
Capacitor blocks__________ after long time.
alternating current
direct current
both alternating and direct current
neither alternating nor direct current
The capacitance between two plates increases with
Shorter plate area and higher applied voltage
Shorter play area and shorter distance between them
Larger plate area, longer distance between plates and higher applied voltage
Larger plate area and shorter distance between plates
The capacitance C is charged through a resistor R. The time constant of the charging circuit is given by
C/R
1/RC
RC
R/C
Three capacitors 1.0 μ F, 1.5 μ F and 2.0 μ F are connected in series.
What is the equivalent capacitance of the capacitors?
4.50 μ F
2.17 μ F
0.46 μ F
1.25 μ F
Two capacitors, 1.0 μ F and 0.5 μ F are connected in series to a 100 V current supply.
What is the amount of charge stored in the 1.0 μ F?
150 μ C
100 μ C
50 μ C
33 μ C
Capacitor C1 is connected across a battery of 5 V. An identical capacitor C2 is connected across a battery of 10 V. Which one has the most charge?
C1
C2
both have the same charge
it depends on other factors
Which of the following statements is described a charge on capacitors P, Q and R as shown
in FIGURE 17.1.
The charge in P is more than the charge in Q and R.
The charge in Q is more than the charge in P and R.
The charge in R is more than the charge in P and Q.
The total charge in Q and R is more than the charge in P.
Which of the following statement are CORRECT about the FIGURE 17.2?
Charge across C2 and C3 are same.
Voltage across C1 and C2 are same.
Total capacitance is 2.25 μ F
Total voltage across C2 and C3 are 16 V
In the circuit shown, capacitor C is initially uncharged.
At time t = 0, the switch S is closed.
Which of the following statements is correct
regarding the charging of the capacitor?
Immediately after S is closed, the current in the circuit rise slowly until a maximum value.
Immediately after S is closed, the current in the circuit is a maximum, the current then decreases.
The capacitor is fully charged after a time t = CR
The current in the circuit at any time only depends on the resistance R and is independent of the capacitance C.
When a charged capacitor is connected in series with a filament lamp and a variable resistor, the lamp lights up. The lamp will stay lighten for a period if the
Resistance of the resistor is small
Capacitance of the capacitor is large
Resistance of the filament lamp is small
Potential difference across the lamp is small
Which of the following statements is NOT TRUE about capacitance?
The ratio of the total charge on either plate to the potential difference between both
plates.
The unit is CV-1
A device consist two metal plates separated by insulator.
The unit is Farad.
A capacitor of capacitance C is charged using a battery. The charge on the capacitor is Q and
the potential difference across it is V. The battery is removed, and an identical capacitor
which is not charged is connected in parallel to the charged capacitor. Which of the
following statements is correct?
The final charge on each capacitor is 2Q
The potential difference across both the capacitors is V
Total energy stored remains the same
The effective capacitance is 2C
A parallel-plate capacitor of cross -sectional area A is connected across a battery of potential difference V. A dielectric is then inserted into the capacitor. If the relative permittivity of the dielectric is 2.5.
Calculate the ratio of charge on the capacitor without the electric to the charge on the capacitor with dielectric.
1:4
2:5
1:2
5:2
