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| Column $I$ | Column $II$ |
| $(A)$ $E=0$ | $Image$ Charges are at the corners of a regular hexagon. $\mathrm{M}$ is at the centre of the hexagon. $\mathrm{PQ}$ is perpendicular to the plane of the hexagon. |
| $(B)$ $V \neq 0$ | $Image$ Charges are on a line perpendicular to $\mathrm{PQ}$ at equal intervals. $\mathrm{M}$ is the mid-point between the two innermost charges. |
| $(C)$ $B=0$ | $Image$ Charges are placed on two coplanar insulating rings at equal intervals. $\mathrm{M}$ is the common centre of the rings. $\mathrm{PQ}$ is perpendicular to the plane of the rings. |
| $(D)$ $\mu \neq 0$ | $Image$ Charges are placed at the corners of a rectangle of sides $a$ and $2 a$ and at the mid points of the longer sides. $\mathrm{M}$ is at the centre of the rectangle. $\mathrm{PQ}$ is parallel to the longer sides. |
| $Image$ Charges are placed on two coplanar, identical insulating rings at equal intervals. $\mathrm{M}$ is the mid-point between the centres of the rings. $\mathrm{PQ}$ is perpendicular to the line joining the centres and coplanar to the rings. |
