A current carrying circular loop of radius R is placed in the XY-plane with center at the origin. Half of the loop with 
is now bent, so that it now lies in the YZ-plane. Then,
increases. 
is unchanged.
Text Solution
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The direction of magnetic moment of circular loop of radius R is placed in the XY-plane is along z-direction and its magnitude is given by 
. When half of the loop with 
is bent, such that it now lies in the YZ-plane, the magnitudes of magnetic moment of each semi-circular loop of radius R lie in the XY-plane and the YZ-plane having magnitude 
each and the direction of magnetic moments are along z-direction and x-direction, respectively.
Their resultant, 
So, 
or 
diminishes.
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