A wooden cubical block ABCDEFG of mass m and side a is wrapped by a square wire loop of perimeter 4a, carying current I. The whole system is placed at frictionless horizontal surface in a uniform magnetic field `vecB=B_0hatj` as shown in fig. In this situation, normal force between horizontal surface and block passes through a point at a distance x from centre. Choose correct statement (s).
A. The block must not topple if `Ilt (mg)/(aB_0)`
B. The block must not topple if `Ilt (mg)/(2aB_0)`
C. `x=a/4 if I=(mg)/(2aB_0)`
D. `x=a/4 if I=(mg)/(4aB_0)`