From LIAM ROCHE
In reply to Pat Delgado’s letter (29 May) concerning ‘magnetic monopoles’, I have a number of points to make. Firstly, the devices he describes are not true monopoles as they have no net magnetic charge. Any student of Maxwellian electrodynamics would be able to deduce that the net magnetic flux through a closed surface surrounding any such device is zero.
In particular, a spherical device such as the one described at the end of Delgado’s letter would produce no external magnetic field, if genuinely spherically symmetric.
A diagram of some magnetic field lines should help to clarify the situation.
Liam Roche Watford, Hertfordshire
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