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The induced emf is picked by point electrodes made from ______ in electromagnetic blood flowmeter.

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The induced emf is picked by point electrodes made from ______ in electromagnetic blood flowmeter.

(a) copper

(b) graphite

(c) platinium

(d) copper tungsten

This question was posed to me in an internship interview.

Enquiry is from Application of Telemedicine in chapter Telemedicine Technology of Biomedical Instrumentation

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Right choice is (c) platinium

For explanation: In actual practice, the electromagnetic flowmeter transducer (Wyatt, 1984) is a tube of non-magnetic material to ensure that the magnetic flux does not bypass the flowing liquid and go into the walls of the tube. The tube is made of a conducting material and generally has an insulating lining to prevent short circuiting of the induced emf. The induced emf is picked up by point electrodes made from stainless steel or platinum.

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