| LIST I | LIST II | ||
| A. | Magnetic dipole moment | I. | Weber/$m^2$ |
| B. | Magnetic permeability | II. | Am (Ampere m) |
| C. | Pole strength | III. | Henry/m |
| D. | Magnetic flux density | IV. | $Am^2$ (Ampere $m^2$) |

Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. a healthy diet and regular exercise
Q. are important habits
R. that help maintain good physical and mental health
S. especially in today's busy world