Right choice is (b) False
To explain: False, The operating principle underlying all electromagnetic type flowmeters is based upon Faraday’s law of electromagnetic induction which states that when a conductor is moved at right angles through a magnetic field in a direction at right angles both to the magnetic field and its length, an emf is induced in the conductor. In the flowmeter, an electromagnetic assembly provides the magnetic field placed at right angles to the blood vessel in which the flow is to be measured.