DC voltage of the order of a few mV can be accurately of measured by
Answer : Option C
Assertion (A): The gall tinsley potentiometer is a coordinate potentiometer and has two exactly similar potentiometers.
Reason (R): An ac potentiometer may measure the unknown voltage in polar form or rectangular coordinate form.
Answer : Option B
Which of the following is used as detector in audio frequency ac bridges?
has an input impedance consisting of 1 M`Omega` and 20 pF is parallel. A high
impedance probe connected to input of this oscilloscope has a 10 M`Omega`
series resistance. This 10 M`Omega` series resistance
Rayleigh current balance is an absolute instrument.
Answer : Option A