Components
Formulae
If Bridge is Balanced:
There will be no potencial difference across the terminal of the sound-sensor.Current through the sound-sensor: 0
` C_1=frac(C_2R_4)(R_3)`
`R_1=frac(R_3C_4)(C_2)`
If Bridge is Unbalanced:
There will be some potencial difference across the terminal of the speaker.
Hence, some current will flow through the speaker and it's effect can be heared.
Schering Bridge Experiment :
- •Pick up resistances, capacitors, ac source and speaker from the toolbox.
- •Make the connections (red-dot act as source and black-dot act as destination) as shown in the
figure to form a Schering bridge.
- •After making the circuit click on check circuit button to check the connections.
- •Select the capacitance and resistor R3.Now enter ac source voltage (in Volt), source-frequency
(in Hz) and choose appropriate value of R4 (in Ω ) through slider then click on the submit button.
- •Repeat the experiment untill the bridge gets balanced.
- •Select the ratio of R4/R3 in multiple of 100
close
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Schering Bridge Experiment:
If Bridge is Balanced:
There will be no potencial difference across the terminal of the sound-sensorCurrent through the sound-sensor: 0
`Z_1=R_1-frac(1)(jomegaC_1)`,`Z_2=-frac(1)(jomegaC_2)`
`Z_3=R_3`,
` Z_(1)Z_4=Z_2Z_3`
Now we need to substitute the impedence value's of Schering bridge in the above equation
Then
`(R_1-frac(1)(jomegaC_1))(frac(R_4)(1+jomegaC_4R_4))=(-frac(1)(jomegaC_2))R_3`
Now we need to equate the real and imaginary terms of the above equations
We get,
` C_1=frac(C_2R_4)(R_3)`
`R_1=frac(R_3C_4)(C_2)`
If Bridge is Unbalanced:
There will be some potencial difference across the terminal of the speaker.
Hence, some current will flow through the speaker and it's effect can be heared.
Calculations
Observation Table
| `R_1` in(Ω) | `C_1` in(μF) | `R_3` in(Ω) | `C_4` in(μF) | `R_4` in(Ω) | `V` in(volt) | `f_r` in(Hz) |
|---|