Measurement and Instrumentation
The given figure shows wein bridge connection for frequency measurement. C and R are variables and gang together. For balanced condition the expression for frequency is f = 1/2πCR when

 R1 = R2/2.
 R1 = R2.
 R1 = 3R2.
 R1 = 2R2.

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Measurement and Instrumentation
The measurement of a quantity

 is a comparison of an unknown quantity with another quantity.
 none of these.
  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with known quantity.

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