Figure P28.90 shows two square loops of wire. The loop on the right is fixed in

Question

Figure P28.90 shows two square loops of wire. The loop on the right is fixed in place, and the one on the left is free to pivot in any direction. Both loops carry a current that is counterclockwise when viewed from above. What is the direction of the magnetic field created by the right loop at the left loop? What is the initial direction of the magnetic dipole moment of the left loop? How does the left loop rotate? After the left loop is allowed to rotate and the system reaches equilibrium, are the magnetic dipole moments of the two loops parallel, antiparallel, or neither?

Explanation / Answer

a) the direction of magneric field in left loop by right loop is downwards i.e. away from viewer using right hand thumb rule.

b) magnetic dipole moment direction of left loop is upwards i.e. towards viewer

c) left loop in this position is in unstable equilibrium condition so when disturbed will move counter clockwise

d) they will reach stable equilibrium in anti parallel condition.

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