It can be used to find out the average resistance per unit length of the meter bridge wire. Viva voce meter bridge experiment with explanation. The kelvin bridge or thompson bridge is used for measuring the unknown resistances having a value less than 1 it is the modified form of. Specific resistance is a measure of the potential electrical resistance of a conductive material. To find low resistance by carey foster bridge calibrating bridgewire. Watch this video to know more about carey fosters bridge experiment. Download our viva questions on carey foster bridge experiment ebooks for free and learn more about viva questions on carey foster bridge experiment.
The connections of carey foster slide wire bridge are shown in the below figure. It can be used to find out the average resistance per unit length of. Carey foster bridge is specially used for the comparison of two equal resistances. Carey foster bridge specific resistance of the given coil.
This can me measured using a carey foster bridge which is a bridge circuit used to measure low resistances, or to measure small differences between two large resistances. Hello friends welcome, in this video we will discuss about the viva questions related with viva questions on carey foster bridge. Specific resistance of the material of wire is an important topic of electric current. Which type of transformer is used in sonometer experiment and what is it. Exp obj app galv conn des ef the strip in b kno resis cell galv on t. Aug 16, 2018 kelvin bridge circuit kelvin double bridge august 16, 2018 february 24, 2012 by electrical4u before we introduce kelvin bridge, it is very essential to know what is the need of this bridge, though we have wheatstone bridge which is capable of measuring electrical resistance accurately usually an accuracy of around 0. Measurement of unknown resistance using careyfoster s bridge debangshu mukherjee bs. It is important to have a very good understanding of resistance in order to understand specific resistance. He first described it in his 1872 paper on a modified form of wheatstones bridge, and methods of measuring small resistances telegraph engineers journal, 1872. In electronics, the carey foster bridge is a bridge circuit used to measure medium resistances, or to measure small differences between two large resistances. Carey foster bridge electrical resistance and conductance. Resistances p and q are first adjusted so that the ratio p q is approximately equal to the ratio rs. It works on the same principle as wheatstones bridge, which consists of four resistances, p, q, r and s that are connected to each other as shown in the circuit diagram in figure 1. Why are you using the carey fosters bridge instead of meter bridge.
Which type of waves are produced in sonometer experiment. Guatemala political organization viva veterinary information verifying agency american association of. In the adjacent diagram, x and y are resistances to be compared. Feb 07, 2018 viva voce meter bridge experiment with explanationquestion answer. To study the variation of magnetic field along the axis of current carrying circular coil and then to estimate the radius of the coil. Carey foster bridge is the method used for measurement of medium resistances. It is a device used to measure the angle of rotation of plane of polarisation rotated by an optically active substance.
Do publish questions for other experiments like fly wheel, angle of prism, platinum resistance thermometer, dispersive power, newton rings, diode laser, carey foster bridge, magnetic variation like like. A carey foster s bridge is a modified version of the meter bridge wheatstone bridge or potentiometer. A slidewire of length l being included bet ween r and s as shown. To determine the band gap of a semiconductor using a junction diode apparatus omega type etb 58 experimental training board. To find specific resistance of given wire using carey fosters. Resistance rv \ i, where v is the potential difference applied across the wire and i is the current flowing through it due to the potential difference.
Virtual lab at amrita uses stateoftheart computer simulation technology to create real world environments and problem handling capabilities is required to bridge the gap between institutions or industries that retain the physical laboratory and distantly placed economically challenged educational institutions in areas such as physics, chemistry and biotechnology. Kelvin bridge circuit kelvin double bridge electrical4u. The galvanometer which is used for estimating the quantity of charge flow through it is called the ballistic galvanometer. Wheatstones bridge in this circuit g is the galvanometer and e is a lead accumulator and k 1and k are the galvanometer key and accumulator key respectively. Carey fosters bridge works on the principle of wheatstones bridge. If you do the experiment with copper wire of same diameter as that of brass wire, is. Viva voce meter bridge experiment with explanationquestion. Carey foster bridge is specially suited for the comparison of two nearly equal resistances. The carey foster bridge is used for measuring the low resistance or for the comparison of two nearly two equal resistances. Video tutorial experiment 7 to plot graph showing the variation of magnetic field with distance along the axis of a circular coil carrying current, and hence estimate the radius. Carey foster bridge is very sensitive and we can even measure the decimal value of resistance. A careyfosters bridge is a modified version of the meter bridge wheatstone bridge or potentiometer. These books contain exercises and tutorials to improve your practical skills, at all levels. To study the hall effect and determine hall coeffcient.
To find specific resistance of given wire using carey. What is the principle involved in sonometer experiment. The difference in the value of resistance is equal to the resistances of the differences of bridge wire i. It is vital for the jee aspirants to have good grip on the topic in order to remain competitive in the jee. The bridge wire ef has a jockey contact d placed along it and is slid until the galvanometer g measures zero. Specific rotation of an optically active substance at a given temperature is the rotation in degrees of the plane of polarisation of incident polarized beam produced by one. Pdf physics experiment ritesh raj keshari academia. Anna university physics practical, carey foster bridge to determine specific resistance of the given coil. Introduction the carey foster bridge is an electrical circuit that can be used to measure very small resistances. It is specifically designed to measure resistors that are constructed as four terminal resistors. R is the unknown resistance under experiment, while s is a standard resistance. The kelvin bridge or thompson bridge is used for measuring the unknown resistances having a value less than 1 it is the modified form of the wheatstone bridge. Specific resistance of a material is the resistance of one centimeter length of wire whose. To determine the resistance per unit length of carey fosters bridge wire and specific resistance of the material of the given wire using carey fosters bridge.
A carey foster bridge is principally same as a meter bridge, which consists of four resistances p, q, r and x that are connected to each other as shown in figure 1. The carey foster bridge is often used for the measurement of very low resistances, although it can be used to find, for example. The circuit for carey foster bridge is shown in figure below. Engineering physics lab experiments viva voice question with explanations for vernier caliper edutainment56 hello. The aim of the experiment is to determine the resistance per unit.
The experiment is based on the fact that the energy of the photon relates to its. It mainly consists of four arms of resistance p, q. Find horizontal component of earths magnetic field by using vibration and deflection magnetometer. Thermometer the board consists of the following built in parts 3v d. Measurement of unknown resistance using careyfosters bridge debangshu mukherjee bs. Specific resistance of material of wire using meter bridge. Exact balance is obtained by adjustment of the sliding contact on the slidewire. It was invented by carey foster as a variant on the wheatstone bridge. It depends on the deflection of the coil which is directly proportional to the charge passes through it. This is the simplest and the most basic bridge circuit used in measurement studies. The thickedged areas are busbars of almost zero resistance.
Carey foster bridge experiment related viva question. A kelvin bridge, also called a kelvin double bridge and in some countries a thomson bridge, is a measuring instrument used to measure unknown electrical resistors below 1 ohm. The circuit for careyfoster bridge is shown in figure below. To calibrate the given ammeter and voltmeter by potentiometer.
Carey fosters bridge, decimal resistance box, laclanche cell, galvanometer, thick copper strip, plug key, rheostat of nearly 10 ohm, given wire and connecting wires. The working principle of the ballistic galvanometer is very simple. Can any one plz explain me the principle of carey fosters bridge. Microammeter, 65 mm rectangular dial to read 050 ma. Semiconductor diode oven, electrical heater to heat. What is the difference between the carey foster bridge and.
Experiment 6 to determine the resistance per unit length of a carey fosters bridge wire and also to find out the specific resistance of a given wire. To define what is intensity of magnetic field and on what factors does it depend on recall level describe how the graph vary between distance and. Position of null point changes on the wire when the resistance is connected in the outer gaps is interchanged. Carey foster bridge specific resistance of the given.
Stewards and gees experiment learning objectives for inclass and out of class out of class at the end of watching the video the student should be able to. Theory both the metre bridge and the careyfoster bridge are a simpli. If a monochromatic light source shines on the grating, images of the light will appear at a number of angles. We have already seen some basic methods for measuring medium resistances. Kelvin bridge circuit kelvin double bridge august 16, 2018 february 24, 2012 by electrical4u before we introduce kelvin bridge, it is very essential to know what is the need of this bridge, though we have wheatstone bridge which is capable of measuring electrical resistance accurately usually an accuracy of around 0. P and q are nearly equal resistances, forming the other half of the bridge. Download our carey foster bridge experiment related viva question ebooks for free and learn more about carey foster bridge experiment related viva question. The carey foster bridge in the picture is from denison university, and was made by leeds and northrup of philadelphia. Nov 29, 2012 anna university physics practical, carey foster bridge to determine specific resistance of the given coil. To find the low resistance by carey fosters bridge. Viva voce meter bridge experiment with explanationquestion answer. It is a device, which converts high voltage currents to low voltage currents.