The op-amp in low voltage DC voltmeter cannot be nullified due to
(a) D’Arsonaval meter movement
(b) Offset voltage compensating network
(c) Selection of switch
(d) Gain of amplifier
The question was asked in an international level competition.
I want to ask this question from Voltage to Current Converter with Floating and Grounded Load in chapter Operational Amplifier Applications of Linear Integrated Circuits