Parallel and Series Combination of Capacitors

Q. 17. Four charges are placed at the corners of a square of side a. Work done by external agent in carrying an electron from point O to O' is

Q. A capacitor 1mF withstands a maximum voltage of 6KV, while another capacitor 2mF withstands a maximum voltage of 4KV. If the capacitors are connected in series, the system will withstand a maximum voltage of?

1. 2 KV
2. 4 KV
3. 6 KV
4. 9 KV

Q.

Two devices are in network if (1) a process is running on both devices (2) PIDs of the processes running of different devices are the same (3) a process in one device can exchange information with a process in another device (4) All of the above

Q. A parallel plate capacitor is made by stacking $n$ equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is $C$, then the resultant capacitance is

1. $nC$
2. $(n+1)C$
3. $(n-1)C$
4. $\frac{n}{C}$

Q. Each resistor shown in the figure is an infinite network of resistance $1\Omega$. The effective resistance between points $\text{A}$ and $\text{B}$ is
($\sqrt{3}=1.73$)

1. Less than $1\Omega$
2. $1\Omega$
3. More than $1\Omega$ but less than $3\Omega$
4. $3\Omega$

Q.

Two identical capacitors are joined in parallel charged upto a potential $V$ and than separated, after that again connected in series i.e. the positive plate of one is connected to negative of the other, then

1. the charges on the free plates connected together are destroyed.

2. the charges on the free plates are enhanced.

3. the energy stored in the system increases.
4. the potential difference in the free plates becomes 2V.

Q.

Difference Between Wi-Fi and WiMAX

Q.

How does current flow in a transistor?

Q.

If $C$ and $V$ represent capacitance and voltage respectively, then what are the dimensions of $\lambda$ where $\lambda =\frac{C}{V}$ ?

1. $\left[M^{-2}{L}^{-4}{I}^3{T}^7\right]$

2. $\left[M^{-2}{L}^{-3}{I}^2{T}^6\right]$

3. $\left[M^{-1}{L}^{-3}{I}^{-2}{T}^{-7}\right]$

4. $\left[M^{-3}{L}^{-4}{I}^3{T}^7\right]$

Q.

Does current flow through the capacitor?

Q. Three capacitors each of capacitance 9 pF are connected in series.
(a) What is the total capacitance of the combination?
(b) What is the potential difference across each capacitor if the combination is connected to a 120 V supply?

Q. An uncharged capacitor is fully charged with a battery . the ratio of energy stored in the capacitor to the work done by the battery in this process is

Q.

Two identical conducting rods are first connected independently to two vessels, one containing water at ${100}^{\circ }$C and the other containing ice at $0^{\circ }$C. In the second case, the rods are joined end to end and connected to the same vessels. Let q1and q2 g / s be the rate of melting of ice in two cases respectively. The ratio of $\frac{q1}{q2}$ is

1. 

2. 

3. 

4. 

Q.

A capacitor is made of a flat plate of area A and a sector plate having a stair-like structure as shown in figure (31-E9). The width of each stair is a and the height b. Find the capacitance of the assembly.

Q. a coil o inductive reactance 31 ohm has a resistance o 8 ohm . It is placed in series with a condenser o capacitive reactance 25 ohm. the combination is connected to an AC source o 110 V . the power actor o the circuit is

Q.

What is a electric potential of earth?

Q.

A parallel plate capacitor of area A, plate separation d and capacitance C is filled with three different dielectric materials having dielectric constants $K_1,K_{2}and{K}_3$ as shown in Fig. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant K is given by

1. $\frac{1}{K}=\frac{1}{K_1}+\frac{1}{K_2}+\frac{1}{2K_3}$
   

2. $\frac{1}{K}=\frac{1}{K_1+K_2}+\frac{1}{2K_3}$
   

3. $K=\frac{K_1{K}_2}{K_1+K_2}+2K_3$
   

4. $K=K_1+K_2+K_3$

Q. In the given circuit the potential difference across the $4.5\mu F$ capacitor is

1. $\frac{8}{3}\text{V}$
2. $4\text{V}$
3. $6\text{V}$
4. $8\text{V}$

Q. The capacities of the three capacitors are in ratio 1 : 2 : 3. Their equivalent capacity when connected in parallel is $\frac{60}{11}\mu F$ more than when they are connected in series. The individual capacities of capacitors in $\mu F$ are?

1. 4, 6, 7
2. 1, 2, 3
3. 2, 3, 4
4. 1, 3, 6

Q.

The VM size determines the number of _____.

Q.

The phase difference between alternating current and EMF is π/2 which of the following cannot be constituent of the circuit?

A)LC

B)L

C)C

D)RL

Q. Seven capacitors each of capacitance $2\mu F$ are connected in a configuration to obtain an effective capacitance $\frac{10}{11}\mu F$. Which of the following combination will achieve the desired result?

1. 
2. 
3. 
4. 

Q. What is the effective capacitance between points $X$ and $Y?$

1. $12\mu F$
2. $18\mu F$
3. $24\mu F$
4. $6\mu F$

Q.

The phase difference between the input and output voltage of the CE amplifier circuit is?

Q. There are two identical capacitor the first one is uncharged and filled with a dielectric of cons†an t K while other one is charged to potential V having air between its plates if the two capacitors are joined end to end the common potential will be

Q.

What happens when a charged capacitor is connected to an uncharged capacitor?

Q. For the given system of charges, where should a third charge $+q$ be placed from negative charge, so that third charge experiences no net force?

1. $\frac{L}{2}$
2. $L$
3. $2L$
4. $3L$

Q. Calculate the potential difference and the energy stored in the capacitor $C_2$ in the circuit shown in the figure. Given potential at A in 90 V, $C_1=20\mu F,C_2=30\mu F$ and $C_3=15\mu F$.

Q.

Four metal plates numbered 1, 2, 3 and 4 are arranged as shown in Fig. The area of each plate is A and the separation between adjacent paltes is d. The capacitance of the arrangement is

1. $\frac{{\epsilon }_{0}A}{d}$
   

2. $\frac{3{\epsilon }_{0}A}{d}$
   

3. $\frac{4{\epsilon }_{0}A}{d}$

4. $\frac{2{\epsilon }_{(}0)A}{d}$
   

Q.

Three capacitors of capacitances 2 pF, 3 pF and 4 pF are connected in parallel.

(a) What is the total capacitance of the combination?

(b) Determine the charge on each capacitor if the combination is connected to a 100 V supply.