More about Q=CV

Q. Two parallel plate capacitors have their plate areas $100{\text{cm}}^2$ and $500{\text{cm}}^2$ respectively. If they have the same charge and potential difference, and the distance between the plates of first capacitor is $0.5\text{mm},$ then the distance between the plates of second capacitor is

1. $0.10\text{cm}$
2. $0.25\text{cm}$
3. $0.20\text{cm}$
4. $0.15\text{cm}$

Q.

Can Capacitors be negative?

Q. Find the net electric potential at the point $\text{A}$ for the figure shown below :

1. $\frac{Kq}{5}$
2. $\frac{Kq}{4}$
3. $Kq$
4. $\frac{Kq}{2}$

Q. A parallel plate capacitor having capacitance $12\text{pF}$ is charged by a battery to a potential difference of $10\text{V}$ between its plates. The charging battery is now disconnected and a porcelain slab of dielectric constant $6.5$ is placed between the plates. The work done by the capacitor on the slab is:

1. $600\text{pJ}$
2. $560\text{pJ}$
3. $692\text{pJ}$
4. $508\text{pJ}$

Q. Two parallel plate capacitors have their plate areas $100{\text{cm}}^2$ and $500{\text{cm}}^2$ respectively. If they have the same charge and potential difference, and the distance between the plates of first capacitor is $0.5\text{mm},$ then the distance between the plates of second capacitor is

1. $0.15\text{cm}$
2. $0.10\text{cm}$
3. $0.20\text{cm}$
4. $0.25\text{cm}$

Q. Three capacitors each of $3\mu \text{F}$ are connected in a circuit. The maximum and minimum equivalent capacitance that can be obtained using these capacitors are

1. $8\mu \text{F},2\mu \text{F}$
2. $9\mu \text{F},1\mu \text{F}$
3. $9\mu \text{F},0\mu \text{F}$
4. $3\mu \text{F},2\mu \text{F}$

Q. In the circuit shown in figure, after closing the switch $S$, what is the change in current flowing through the resistance $A$?

1. No change in the value of current passing through resistance $A$
2. The current passing through resistance $A$ increases
3. The current passing through resistance $A$ decreases
4. Data is insufficient to say anything

Q. Two condensers C₁ and C₂ in a circuit are joined as shown in the figure The potential of point A is V₁ and that of B is V₂. The potential of point D will be

1. 

2. 

3. 

4. Zero

Q.

Two conducting spheres of radii $r_1$ and r₂ are at the same potential. Their charges are in the ratio of

1. 

2. 

3. 

4. 

Q. Three capacitors each of $3\mu \text{F}$ are connected in a circuit. The maximum and minimum equivalent capacitance that can be obtained using these capacitors are

1. $9\mu \text{F},0\mu \text{F}$
2. $9\mu \text{F},1\mu \text{F}$
3. $8\mu \text{F},2\mu \text{F}$
4. $3\mu \text{F},2\mu \text{F}$

Q. The potentials of the two plates of capacitor are + 10V and -10 V. The charge on one of the plates is 40 C. The capacitance of the capacitor is
[AFMC 2005]

1. 2 F
2. 4 F
3. 0.5 F
4. 0.25 F