A thin stiff insulated metal wire is bent into a circular loop with its two ends extending tangentially from the same point of the loop. The wire loop has mass and radius
and it is in a uniform vertical magnetic field 
, as shown in the figure. Initially, it hangs vertically downwards, because of acceleration due to gravity 
, on two conducting supports at 
and 
. When a current 
is passed through the loop, the loop turns about the line 
by an angle 
given by
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