List of top Electrical and Electronics Measurements Questions on Bridges and Potentiometers asked in GATE IN

The bridge shown is balanced when \( R_1 = 100 \, \Omega \), \( R_2 = 210 \, \Omega \), \( C_2 = 2.9 \, \mu\text{F} \), and \( R_4 = 50 \, \Omega \). The 2 kHz sine-wave generator supplies a voltage of 10 V\(_\text{p-p}\). The value of \( L_3 \) (in millihenry) is _________ (round off to two decimal places)
In the Wheatstone bridge circuit shown, \( R_1 = 1.5 \, k\Omega \) and \( R_2 = R_3 = R_4 = 1 \, k\Omega \). The switch is initially open and the voltage between the points C and D is \( V_{CD} \). Upon closing the switch at \( t = 0 \), the resistance in the arm AD changes by an amount \( \delta R_1 \), and the voltage between C and D changes by \( \delta V_{CD} \). The sensitivity of the bridge in volt/kilohm, defined as \( \left| \frac{\delta V_{CD}}{\delta R_1} \right| \), is _________.
Monochromatic light of wavelength 532 nm is used to measure the absorption coefficient of a material in a UV-Visible Spectrophotometer. The measured light intensity after transmission through a 1 cm thick sample of the material is 0.414 mW/cm\(^2\). For a sample of thickness 2 cm, the measured light intensity is 0.186 mW/cm\(^2\). The absorption coefficient (in cm\(^{-1}\)) of the material is _________ (round off to two decimal places)