A Capacitor is a device which has the ability or capacity to store
energy in the form of an electrical charge producing a potential
difference ( static voltage) across its plates, much like a small
rechargeable battery.
Q1 A 2╬╝F, 4╬╝F and 10╬╝F capacitor are connected in series. The total capacitance is
- 2╬╝F
- 4╬╝F
- 1.1╬╝F
- 1.5╬╝F
- 1.1╬╝F
Equivalent capacitance in series is 1/C = 1/C1 + 1/C2+1/C3
Q2 A 10 ╬╝F, 20 ╬╝F, 22 ╬╝F, and 100 ╬╝F capacitor are in parallel. The total capacitance is
- 2.43 ╬╝F
- 4.86 ╬╝F
- 100 ╬╝F
- 152 ╬╝F
- 152 ╬╝F
(Equivalent capacitance in parallel connection is C= C1+ C2+C3)
Q3 Two Capacitors of 2 ╬╝F and 3 ╬╝F are connected in series across 10 V. The potential difference across the 2 ╬╝F capacitor will be
- 4 V
- 6 V
- 8 V
- 10 V
- 6 V
(Use formulae Q = CV)
Q4 Work done in charging a capacitor is
- `\frac{1}{2}`QV
- QV
- `Q^{2}V`
- 2QV
- `\frac{1}{2}`QV
Q5 Energy store in a 4000 ╬╝F capacitor charged to a potential difference of 50V will be
- 50J
- 10J
- 5J
- 100J
- 5J Energy stored in a charged capacitor is `\frac{1}{2}`C`V^{2}`
Q6 We get maximum energy from a set of capacitors?
- When they are connected in parallel.
- When they are connected in series.
- Both a and b.
- None of these.
- Both a and b.
Q7 If the charge in a capacitor is 4C and the energy stored in it is 4J, find the value of capacitance. .
- 2F
- 4F
- 8F
- 16F
2F
Q8 There is some loss of energy when two capacitors are combined
- True
- False
- True
Q9 If the distance between the plates of parallel plate capacitor is halved and the dielectric constant is doubled, then its capacity will
- Increase by 16 times
- Increase by 4 times
- Increase by 2 times
- remains the same
- Increase by 4 times
Q10 A parallel plate capacitor is charged and then isolated. When a dielectric material is inserted between the plates of the capacitor, which of the following does not change ?
- Electric field between the plates
- Energy stored in the capacitor
- Potential difference across the plates
- Charge on plates
- Charge on plates
