A meter bridge is an electric device used for measuring an unknown resistance. Recent questions tagged meterbridgeandpotentiometer. A meter bridge is the practical application of wheatstone bridge arrangement as shown in figure below. Meter bridge formula and finding the values of unknown resistance. In above figure ac is a 1m long wire made of maganin or constanan having uniform area of cross. Aim to find the resistance of a given wire using meter bridge and hence determine resistivity of its material. The terminal b is connected to one ter minal of the galvanometer g. Metre bridge law of combination of resistors procedure.
Meter bridge determination of specific resistance experiment. Now, the resistance is put inside an enclosure maintained at a higher temperature. Two gaps are formed on it by using thick metal strips in order to make the wheat stones bridge. Physics cbse practical file class 12 with accurate readings. Meterbridge slide wire bridge meter bridge is based on the principle of wheatstone bridge and it is used to find the resistance of an unknown conductor or to compare two unknown resistance. A meter bridge is used in finding the unknown resistance of a conductor as that of in a wheatstone bridge. To understand how to find resistance of a given wire using metre bridge and to determine the. In this bridge one lateral pair of resistances is replaced by a straight wire of length 1m of uniform cross section. Jun 23, 2015 physics investigatory project on wheatstone bridge. In the meter bridge experiment, balance point was observed at. Metre bridgeresistance of a wire meity olabs youtube. How to calculate unknown resistance using meter bridge. Measure the diameter of the wire at least at four places, in two mutually perpendicular directions at each place with the help of screw gauge.
Potentiometer construction, working and applications elprocus. Figure below shows a schematic diagram of a meter bridge. So the resistance across the portion ab of the wire is r w l 1 and that the resistance across the point bc is r w 100 l 1. Class 12th practical physics experiment of finding the specific resistance of a wire using meter bridge by anshu kapoor part i donate with paytm. Connect two resistances x 1 and x 2 in series and repeat the experiment keeping this combination in gap g 1 and.
Pdf investigatory projects physics class 12 cbse pdf. If we are doing the meter bridge experiment in the lab, by adjusting the value of resistance box the galvanometer. A potentiometer is an electric device used to measure the emf and internal resistance of a cell, to compare emf of two cells and a potential difference between two points in an electric circuit. The practical diagram is shown in the below figure. In a meter bridge experiment, the null point for the unknown resistance is measured. Where can i get the readings of class 12 physics practicals. Meter bridge or slide wire bridge self study point. To verify the laws of combination series of resistance. Meter bridge is based on the principle of wheatstone bridge. Jan 27, 2018 meter bridge experiment class 12, 2018. Important questions for cbse class 12 physics kirchhoffs.
Your browser does not currently recognize any of the video formats available. A one meter length wire, made of an alloy that has a much higher resistance than that of a similar copper wire, is strung between points a and d, forming the lower part of the circuit. It works in the principle of the balanced condition of wheatstone bridge. To find the resistance of a given wire using a metre bridge and hence determine the specific resistance of its materials. Repeat the experiment with different values of known resistance r. Ab is a uniform wire 100 cm1m long, stretched in two segments of 50 cms. A mean value of the unknown resistance calculated will be considered as the value of unknown resistance. Physics practical class 12 for board examination 2019 20. The null point can be obtained at the same point as before by decreasing the value of the standard resistance. A meter bridge also called a slide wire bridge is an instrument that works on the principle of a wheatstone bridge. Metre bridge, a wire about 1m long of material whose specific resistance is to be determined, a resistance box, a rheostat, galvanometer, a jockey, oneway key.
Jun 27, 2015 meter bridge is based on the principle of wheat stone bridge and it is used to find the resistance of an unknown conductor or to compare two unknown resistance. In the meter bridge experiment, balance point was observed at j with aj l. Click here to visit our frequently asked questions about html5. The class 12 physics cbse ncert free pdf download is primarily designed for students who are preparing for their upcoming class 12 cbse board exams. Drag one of the wires to the right gap of the metre bridge. Potentiometers work by varying the position of a sliding contact across a uniform resistance. What would be the new position of balance point ii if the galvanometer and battery are interchanged at the balance position, how will the balance point get affected. Meter bridge specific resistance by anshu kapoorpart i. In a potentiometer, the entire input voltage is applied across the whole length of the resistor, and the output voltage is the voltage drop between the fixed and sliding contact as shown below.
A wheatstone bridge is a kind of electrical circuit used in measuring an electrical resistance, which is unknown by. Meter bridge series and parallel circuits capacitance scribd. Investigatory projects physics class 12 cbse pdf investigatory projects physics class 12 cbse. Meter bridge study material for iit jee askiitians. A meter bridge is an apparatus utilized in finding the unknown resistance of a coil. It can also use as a variable resistor in most of the applications. The 3,869 meter bridge is currently under construction and will be the longest suspension bridge in the world by the length of its main span of 2,023 meters. To find resistance of a given wire using metre bridge physics. And also it is used to compare emfs of different cells. A meter bridge, galvanometer, one way key, a resistance box, a battery jockey, unknown resistance wire about 1 meter long, screw gauge and connecting wires. Physics practical file with readings class 12 cbse. The other terminal of the galvanometer is connected to a jockey j.
Empirical study comparing physical labs, tablets and desktops. So we at eduskool learn from homeyoutube channel are soon going to upload the completely verified physics practical observation and various investigatory projects so that. The meter bridge works under the principle of the wheatstone bridge. To find the resistance of the given wire using meter bridge and hence determine the specific resistance of its material. To find resistance of a given wire using metre bridge and. These potentiometers are used in huge quantities in the manufacture of. The class 12 cbse ncert physics book pdf download explains concepts in a chapterwise format, thus leaving no stone unturned were preparing for the cbse board examinations are concerned. It is the simplest practical application of the wheatstone bridge that is used to measure an unknown resistance.
Using the formula x, we can find out the unknown resistance. The potentiometer is an electric instrument that used to measure the emf electro motive force of a given cell, the internal resistance of a cell. To find the resistance of a given wire using metre bridge you are herehomephysics class 12 metre bridge resistance of a wire. Where r is the resistance from resistance box in the. Measurement of unknown resistance using careyfosters bridge debangshu mukherjee bs.
C expands global development through overseas projects. The unknown resistance s is connected in the gap e and a resistance box r box in gap f of the metre bridge. Jan 12, 2020 a potentiometer is a passive electronic component. Now, the experiment is repeated with the other unknown resistance r2 in the right gap. The four resistances are connected to each other as shown. The metre bridge is operates under wheatstones principle.
Ncert book class 12 physics pdf free download part 1 and 2. Jan 07, 2016 meter bridge determination of specific resistance experiment edunovus online smart practicals. The meter bridge is a device for measurement of resistance using the principle of wheatstone network. Cbse cbse class 12 cbse class 12 physics practical to find resistance of given wire using metre bridge and hence determine the resistivity of its material experiment. Meter bridge experiment using wheatstone bridge principle. To find the resistance of a given wire using meter bridge and hence determine the resistivity specific resistance of its material. A meter bridge is an apparatus used to find the resistance of a coil. Physics investigatory project on wheatstone bridge. Its working is based on the principle of wheatstone bridge.
I cm is the length of metre bridge wire from zero end upto balance point. Thank you very much for physics and chemistry practicals are you sure you want to yes no. The metre bridge precautions when using a metre bridge 1 the value of the known resistance s should be chosen so that the balance point comes somewhere on the middle third of the wire, i. Part of made in india, design innovation workshop,2015 a fresh new experience in project.
Meter bridge article about meter bridge by the free dictionary. Finding the resistance of a given wire using meter. Physics practical class 12 all study guide at one place. State the principal and working of a meter bridge physics. Aug 29, 2017 spread the love determining the resistance per cm of a given wire by plotting a graph of potential difference versus current finding the resistance of a given wire using meter bridge and hence determine resistivity of its material to verify laws of combination parallel of resistance using meter bridge to verify the laws of combination continue reading physics. Now you can select your desired resistance from the resistance box just by clicking on the box and then choosing the resistance from the popwindow, select resistance. Class 12 computer practicals class 12 chemistry practicals class 12 physics practicals here you go.
This video explains how to find the resistance of a given wire using a metre bridge and hence determine the specific resistance of its materials. With your download, get the 8 best papers relevant to this one, including 7 top related papers. Dec 04, 2015 ii in the meter bridge experimental set up, shown in the figure, the null point d is obtained at a distance of 40 cm from end a of the meter bridge wire. The below figure 12 is the diagram of a useful meter bridge instrument. Meter bridge also known as slide wire bridge is used to find the unknown resistance of a material. The metre bridge, also known as the slide wire bridge consists of a one metre long wire of uniform cross sectional area, fixed on a wooden block. Nov 25, 2016 cut the resistance wire at the points where it leaves the terminals, stretch it and find its length by using a metre scale. Meter bridge determination of specific resistance experiment edunovus online smart practicals. The physics practicals for class 12 cbse is given here so that students can understand the experiments in a better way. The experiment records and activities consist of 6 marks, the project has 3 marks and viva on the experiment consist of 5 marks. Hello there i myself have gone through this trouble before as well as now.
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