A current carrying circular coil behaves as a bar magnet whose magnetic moment is M = NiA; Where N = Number of turns in the coil, i = Current through the coil  and A = Area of the coil

Magnetic field of a current carrying coil is a vector and it's direction is given by right hand thumb rule

Behaviour of Current loop In a Magnetic Field

(1) Torque :Consider a rectangular current carrying coil PQRS having N turns and area A, placed in a uniform field B, in such a way that the normal  to the coil makes an angle q with the direction of B. the coil experiences a torque given by t = NBiA sinq . Vectorially 

(2) Workdone : If coil is rotated through an angle q from it's equilibrium position then required work.  It is maximum when θ = 180^o => W_­max = 2 MB

(3) Potential energy : Is given by U = - MB cosθ

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