How to calculate Torque??

the moment of a megnetic dipole is:
->P=N*i*A*n^    where N is the number of loops,\
i is the current in a loop
A is the surface of a loop
n^ is the normal vectore to the plane, which its directions obeys right-hand rule, curling your fingers in the direction of current, and the direction of yopur thumb is the direction of n^

the torque of this dipole obtains from this formula:
->t=->P cross  ->B   (in which B is the vector of magnetic field)

The excerted force on each current having wire is:
F=i ->L cross ->B

so now you can calculate the torque and force