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Dynamometer type wattmeter has _________

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Dynamometer type wattmeter has _________

(a) strong magnetic field

(b) intermediate magnetic field

(c) weak magnetic field

(d) no magnetic field

This question was posed to me by my school teacher while I was bunking the class.

Asked question is from Errors in Dynamometer Wattmeter in portion Measurement of Power and Related Parameters of Electrical Measurements

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The correct answer is (c) weak magnetic field

To explain I would say: Dynamometer type wattmeter consists of a weak magnetic field. It is affected by stray magnetic fields. As a result, wattmeters are shielded to offset effects of stray magnetic fields.

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