A thin rectangular conducting plate of length a and width b is placed in the xy-plane in two different orientations as shown in the figures below. in both cases

A thin rectangular conducting plate of length a and width b is placed in the xy-plane in two different orientations as shown in the figures below. In both cases a magnetic field B is applied in the z -direction and a current flows in the x direction due to the applied voltage V . b OP If the Hall voltage across the y-direction in the two cases satisfy V, =2/, the ratio a:b must be (a) 1:2 (b) 1:2 (C) 2:1 (d) v2:1