A magnetic circuit (400) comprises a magnetic path which includes at least one magnetic source (102) arranged to generate magnetic flux within the magnetic path. A magnetic flux-concentrating element 402 is magnetically coupled to the magnetic source, and arranged to concentrate magnetic-flux generated by the magnetic source within a volume adjacent to the magnetic flux-concentrating element (402). Some embodiments of the magnetic circuit (400) comprise at least first (102) and second (104) magnetic sources, which may advantageously be arranged to generate magnetic flux in a common direction within the magnetic path.
