Question

Find integral B.dl over following loops (Direction in which integration has to be performed is indicated by arrows)

Answer 1

We can say that to achieve stable equilibrium the plane should be in vertical direction.

Explanation:

• The integral of b.dl over the loops show that the planer is carrying the current.  The loop is suspended in a vertical direction.
• The vertical direction of the loop shows that the plane is normal to the magnetic meridian.
• Both the plane and the magnetic meridian are in stable equilibrium.
• Thus we can say that to achieve stable equilibrium the plane should be in vertical direction.