A current loop in a magnetic field

When a current loop is placed in a magnetic field it experiences a torque. It is given byτ→=M→×B→Where M→is the magnetic moment of the loop andB→is the magnetic field.or τ=MBsinθ where θ is angle between M and BWhen M→ and B→ are parallel (i.e. θ = 0°) the equilibrium is stable and when they are antiparallel (i .e. θ=π) the equilibrium is unstable.