Objects that respond to magnetic fields - especially metals - then perturb the induced field.
(Objects that respond to magnetic fields; perturb; the induced field; T:then) Context(Objects that respond to magnetic fields perturb,List([0, 74))):(Objects; respond; to magnetic fields)
Objects that respond to magnetic fields perturb,List([0, 74))
Objects that respond to magnetic fields Objects
perturb respond
the induced field T:then
to magnetic fields