Q. The op-amp in low voltage DC voltmeter cannot be nullified due to

A
D?rsonaval meter movement
B
Offset voltage compensating network
C
Selection of switch
D
Gain of amplifier
Solution:

The op-amp sometimes cannot be nullified because the output is very sensitive to even slight variation in wiper position of D?rsonaval meter movement (ammeter with a full scale deflection of 1mA).

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