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Air cored electromagnets are used in probes having a diameter _________

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Air cored electromagnets are used in probes having a diameter _________

(a) between 0.5 to 1 mm

(b) between 1 to 2 mm

(c) below  8.2 mm

(d) above 8.2 mm

I have been asked this question during an interview.

Question is taken from Application of Telemedicine in section Telemedicine Technology of Biomedical Instrumentation

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Correct option is (d) above 8.2 mm

For explanation I would say: Iron cored electromagnets are used in probes having a diameter between 1 to 8.2 mm, and air cored electromagnets are used in diameters above 8.2 mm. Cannulated probes for extracorporeal use can have greater field strengths and magnet size as the constraint of small size is no longer present.

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