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Six point charges, each of the same magnitude \( q \), are arranged in different manners as shown in Column II. In each case, point \( M \) and line \( P Q \) 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 \( P Q \). Let \( B \) be the magnetic field at \( M \) and \( \mu \) be the magnetic moment of the system in this condition. Assume each rotating charge to be equivalent to a steady urrent.
iii. \( B=0 \)
c. Charges are placed on two coplanar insulating rings at equal intervals. \( M \) is the common center of the rings. \( P Q \) is perpendicular to the plane of the rings
iv. \( \mu \neq 0 \)
d. Charges are placed at the corners of a rectangle of sides \( a \) and \( 2 a \) and at the midpoints of the longer sides. \( M \) is at the center of the rectangle. \( P Q \) is parallel to the longer sides
e. Charges are placed on two coplanar, identical insulating rings at equal intervals. \( M \) is the midpoint between the centers of the rings. \( P Q \) is perpendicular to the line joining the centers and coplanar to the rings.
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