Measurement and Instrumentation
The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?

1/49.99 ohms
2 Ohms
1 Ohm
49.99 Ohms

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Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

 It loads the circuit to maximum extent.
 It loads the circuit moderately.
  It does not load the circuit at all.
 It uses centre zero galvanometer instead of voltmeter.

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