A parallel plate capacitor is connected to a battery as shown in the figure. Consider two situations.

      

A:	Key K is kept closed and plates of capacitors are moved apart using the insulating handle.
B:	Key K is opened and plates of capacitors are moved apart using the insulating handle.

Choose the correct option(s):

a.	In A, Q remains the same but C changes.
b.	In B, V remains the same but C changes.
c.	In A, V remains the same and hence Q changes.
d.	In B, Q remains the same and hence V changes.

1. a and b
2. a and d
3. b and c
4. c and d

Equipotential at a great distance from a collection of charges whose total sum is not zero are approximately:

A parallel plate capacitor is made of two dielectric blocks in series. One of the blocks has thickness d₁ and dielectric constant K₁ and the other has thickness d₂ and dielectric constant K₂, as shown in the figure. This arrangement can be thought of as a dielectric slab of thickness d = d₁ + d₂ and effective dielectric constant K. K is:  

Consider a uniform electric field in the Z-direction. The potential is constant:

1.  (a, b, c)
2.  (a, c, d)
3.  (b, c, d)
4.  (c, d)

Equipotential surfaces:

Choose the correct statement(s): 
1. a, b and c
2. a, c and d
3. b, c and d
4. c and d

In the circuit shown in the figure initially key K₁ is closed and key K₂ is open. Then K₁ is opened and K₂ is closed (order is important).
[Take Q₁ and Q₂ as charges on C₁ and C₂ and V₁ and V₂ as voltage respectively.]
     
Then,

Choose the correct statement(s)
1. a and c
2. a and d
3. b and c
4. c and d

In a region of constant potential:

Choose the correct statement(s): 
1. b and c
2. a and c
3. b and d
4. c and d

The work done to move a charge along an equipotential from A to B:

The potential field of an electric field $\mathrm{E}=\left(\mathrm{y}\hat{\mathrm{i}}+\mathrm{x}\hat{\mathrm{j}}\right)$ is:

Three capacitors A, B and C are connected in a circuit as shown in Fig. What is the charge in $\mathrm{\mu }$C on the capacitor B: