Measurement and Instrumentation
The disc of an instrument using eddy current damping should be of

Conducting and non magnetic material
Conducting and magnetic material
None of the listed here
Non conducting and magnetic material

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Measurement and Instrumentation
A resistance is measured by the voltmeter-ammeter method employing dc excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly

 ± 2.4%
 ± 3.4%
 ± 1.4%
 ± 1%

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