Magnetic field due to currentHard

Question

In the figure, there is a uniform conducting structure in which each small square has side a. The structure is kept in uniform magnetic field B :-In the figure, there is a uniform conducting structure in which each small square has side a. The structure is kept in uniform magnetic field B :-
           

Options

A.The magnetic force on the structure is 2√2 iBa
B.The potential of point B = potential of point D.
C.Potential of point O = potential of point B
D.The magnetic force on the structure is √2 iBa

Solution

Fm = 2 (Bi) (AC)
VB = VO = VD

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