Assertion: Upper wire shown in figure is fixed. At a certain distance 
, lower wire can remain in equilibrium .
Reason: The above equilibrium of lower wire is stable equilibrium.
Text Solution
Verified by ExpertsThe correct answer is:
C
Magnetic force of attraction on lower wire is upwards while its weight is downwards. At a certain distance 
, these two forces are equal. If the lower wire is displaced upwards from this position, then magnetic force will increase but weight will remain same. Therefore, net force is upwards or equilibrium is unstable.
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