Electricity and Magnetism · Problem 10.7

MAGNETIC FIELDS IN MATTER — Edward Purcell & David Morin

Physics — E&M · force-on-dipole

Problem

Derive Eq. (10.26). As usual, work in the approximation where the dipole length

s

is small. Hint: Let the two charges be at positions

\mathbf{r}

and

\mathbf{r} + \mathbf{s}