When a current carrying coil is placed in magnetic field B experiences a torque which is given as τ‌‌=M×B ‌‌=MB‌sin‌θ where, M is the magnetic moment. So, τ is maximum at θ=90∘, i.e. τmax=MB τ is minimum at θ=0 i.e. τmin=0 Now, the flux associated with the coil will be φ=B⋅A=BA‌cos‌θ So, φ is maximum at θ=0 ⇒‌φmax‌=BA φ is minimum at θ‌=90∘ ⇒‌φmin=0