Su­per mag­net re­veals even silent subs

Science Illustrated - - TECHNOLOGY/ SUBMARINES -

ELEC­TRONS GET NO RE­SIS­TANCE

A quantum mag­ne­tome­ter con­sists of a ring made of a su­per­con­duc­tive ma­te­rial – i.e. it has no elec­tri­cal re­sis­tance.

POWER GEN­ER­A­TION

In a su­per­con­duc­tive ma­te­rial, elec­trons will pair up in­stead of be­ing re­pelled. They move about, gen­er­at­ing elec­tric­ity without any re­sis­tance.

FLUCTUATIONS CAUSE RE­SIS­TANCE

Fluctuations of Earth’s mag­netic field ac­cel­er­ate the elec­trons, de­stroy­ing the su­per­con­duc­tiv­ity. So, elec­tric re­sis­tance arises.

VOLTAGE MEA­SURED

Ac­cord­ing to Ohm’s law, elec­tric re­sis­tance also produces voltage, which can be mea­sured very ac­cu­rately. The voltage re­veals if a sub­ma­rine lurks be­low.

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