The figure shows some equipotential lines distributed in space. A charged object is moved from point \(A\) to point \(B\).

Choose the correct option:

1.	The work done in Fig. (i) is the greatest.
2.	The work done in Fig. (ii) is the least.
3.	The work done is the same in Fig. (i), Fig. (ii) and Fig. (iii).
4.	The work done in Fig. (iii) is greater than Fig. (ii) but equal to that in Fig. (i).

Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately:
1. spheres
2. planes
3. paraboloids
4. ellipsoids

 A parallel plate capacitor is made of two dielectric blocks in series. One of the blocks has thickness \(d_1\) and dielectric constant \(K_1\) and the other has thickness \(d_2\) and dielectric constant \(K_2,\) as shown in the figure. This arrangement can be thought as a dielectric slab of thickness \(d=(d_1+d_2),\) and effective dielectric constant \(K.\) The value of \(K\) is:
        

Consider a uniform electric field in the \(z\text-\)direction. The potential is a constant:

 
Choose the correct from the given options:

Choose the correct option:

The work done to move a charge along an equipotential from \(A\) to point \(B:\)
1. cannot be defined as \(-\int_A^B E.dl\)
2. must be defined as \(-\int_A^BE.dl\)
3. is zero
4. can have a non-zero value

In a region of constant potential:

Choose the correct option:

In the circuit shown in the figure initially, key \(K_1\) is closed and key \(K_2\) is open. Then \(K_1\) is opened and \(K_2\) is closed (order is important).
(Take \(Q_1\) and \(Q_2\) as charges on \(C_1\) and \(C_2\) and \(V_1\) and \(V_2\) as voltage respectively.)

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

If a conductor has a potential \(V\neq 0\)  and there are no charges anywhere else outside, then:

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

Then: