List I (Material) | List II (Subsceptibility(χ)) | ||
A. | Diamagnetic | I. | χ = 0 |
B. | Ferromagnetic | II. | 0 > χ ≥ –1 |
C. | Paramagnetic | III. | χ >> 1 |
D. | Non-magnetic | IV. | 0 < χ < ε (a small positive number) |
A bar magnet with a magnetic moment 50 $Am ^2$ is placed in parallel position relative to a magnetic field of 0.4T. The amount of required work done in turning the magnet from parallel to antiparallel position relative to the field direction is