A short bar magnet of magnetic moment 0.2 JT−1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

Here magnetic moment  M=0.2 JT−1Magnetic field  B=0.16 TWhen a bar magnet is placed in a uniform magnetic field, its potential energy  U=-M→.B→ U=-MB cosθFor stable equilibrium  θ=0U=−MB  U=−0.2 JT−1 .(0.16)TU=−0.032 J .