Question

Iron cored electromagnets are used in probes having a diameter between ______

(a) 0.1 to 1 mm

(b) 1 to 8.2 mm

(c) 8.2 to 10 mm

(d) 10 to 15 mm

The question was asked in unit test.

I'd like to ask this question from Application of Telemedicine in chapter Telemedicine Technology of Biomedical Instrumentation

Answer 1

Right option is (b) 1 to 8.2 mm

To explain: 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.