Carey Foster Bridge: Galvanometer & Its Opposite Deflections

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In summary, the Carey Foster Bridge utilizes combinations of resistances and voltages to produce opposite deflections on both ends of the galvanometer. A detailed explanation and graphic of the bridge can be found in the provided link. It is important to carefully consider the factors involved in causing a galvanometer to deflect backwards in order to understand the functioning of the bridge. If this is a homework question, it is recommended to seek help in the appropriate forum and provide a thorough explanation of your attempts and understanding so far.
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anam89
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why galvanometer gives opposite deflection on both of its ends in Carey Foster Bridge ?give me its full explanation and its reasons?
 
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Given the terse way you posted the question - and that it looks like a school/homework question, I can guess you might be short of answers. I will go as far as providing you http://www.bitmesra.ac.in/departments/laboratory/physics/03%20&%2013%20Carey%20Foster%20bridge.pdf" .
It is a PDF file which, aside from the full explanations, has a graphic of a Carey-Foster bridge laid out.

Consider carefully what it takes to make a galvanometer deflect backwards in both those places. Then think what combinations of resistances, including the wire, would make voltages appear at those places to have that effect.

If this was a homework - type question, then this was not the place to post it! If inadvertently done, then try again in the place in the forum where lots of help will be available, provided you set out fully what you have tried, and what you understand of it so far.
 
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Thread moved to Homework Help -- Intro Physics.
 

1. What is a Carey Foster Bridge and how does it work?

A Carey Foster Bridge is a type of electrical circuit used to measure very small resistance values. It works by comparing the unknown resistance with a known resistance using a Wheatstone bridge configuration.

2. What is the difference between a galvanometer and an opposite deflection galvanometer?

A galvanometer is a device used to detect and measure small electrical currents. An opposite deflection galvanometer is a type of galvanometer where the deflection of the needle is in the opposite direction of the current flow, making it easier to read the measurement.

3. How is the resistance of a coil determined using a Carey Foster Bridge?

The resistance of a coil can be determined by balancing the bridge and then using the known resistance value to calculate the unknown resistance. The formula used is Runknown = Rknown x (R1/R2), where R1 and R2 are the two resistors in the bridge.

4. What factors can affect the accuracy of a Carey Foster Bridge measurement?

The accuracy of a Carey Foster Bridge measurement can be affected by factors such as temperature, humidity, and the quality of the components used. It is important to calibrate the bridge and use high-quality resistors to ensure accurate measurements.

5. What are some common applications of a Carey Foster Bridge?

A Carey Foster Bridge is commonly used in scientific research and engineering to measure small resistance values, such as in the study of materials and electronic components. It can also be used in precision measurements, such as in electrical testing and calibration.

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