Solve this.
Q.2. A square loop of side a carries a current I. A uniform magnetic field B is along the z-axis. This loop is placed in magnetic field in four different manners as shown in figures.




Which manner corresponds to stable equilibrium?
(1) a
(2) b
(3) c
(4) d

Dear Student ,
Here in this case applying the Flemming's left hand rule we can say that the torque is zero in the diagram (a) .As hence the angle between the plane of the loop and the magnetic field is 900 .
Thus hence the diagram (a) is in the stable equilibrium .

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