Six point charges, each of the same magnitude q , are arranged in different manners as shown in Column-II. In each case, a point M and a line PQ passing through M are shown. Let E be the electric fiel

Question

Six point charges, each of the same magnitude $q$ , are arranged in different manners as shown in Column-II. In each case, a point $M$ and a line $PQ$ passing through $M$ are shown. Let $E$ be the electric field and $V$ be the electric potential at $M$ (potential at infinity is zero) due to the given charge distribution when it is at rest. Now, the whole system is set into rotation with a constant angular velocity about the line $PQ$ . Let $B$ the magnetic field at $M$ and $μ$ be the magnetic moment of the system in this condition. Assume each rotating charge to be equivalent to a steady current.

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

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