A rectangular loop of sides 
and 
, with its sides parallel to the 
-axis and 
-axis respectively moves with a velocity of 
in the positive 
axis direction, in a space containing a variable magnetic field in the positive 
direction. The field has a gradient of 
along the negative 
direction and it is decreasing with time at the rate of 
. If the resistance of the loop is 
, the power dissipated by the loop as heat is___ 
.
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is the magnetic field at origin
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