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 = 2R2.
 R1 = R2.
 R1 = 3R2.

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Measurement and Instrumentation
If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms

 The bridge is balanced for some specified value of R1, R2, R3.
 The bridge is balanced for some specified value of frequency.
 The bridge can not be balanced.
 The bridge can be balanced.

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