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Practical No. 2 Meter Bridge (Applied Science)
What is Meter Bridge:- The Wheatstone bridge illustrates the concept of a difference measurement, which can be extremely accurate.
on the Wheatstone bridge can be used to measure capacitance, inductance, impedance and other quantities, such as the amount of combustible gases in a sample, with an explosimeter. The Kelvin bridge was specially adapted from the Wheatstone bridge for measuring very low resistances. In many cases, the significance of measuring the unknown resistance is related to measuring the impact of some physical phenomenon (such as force, temperature, pressure, etc.) which thereby allows the use of Wheatstone bridge in measuring those elements indirectly.
What are Practical Outomes of Meter Bridge:-
Practical Outcomes 1. Use Meter Bridge to determine the equivalent resistance of the resistors in series and parallel.
Practical Outomes 2. Use Meter Bridge to estimate specific resistance of a given wire.
What is Wheatstone's principle:-
In applied Science - Physics (22211)
The meter bridge is operates under Wheatstone’s principle. Here, four resistors P, Q, R. and S are connected to form the network ABCD. The terminals A and C are connected to a battery, and the terminals C and D are connected to a galvanometer through kcys Ki and K2 respectively. In the balancing condition, there is no deflection on the galvanometer. Then,
P/Q =R/S
What are apparatus of Meter Bridge:-
Meter Bridge apparatus:The meter bridge, also known as the slide wire bridge consists of a one meter long wire of uniform cross sectional area, fixed on a wooden block. A scale is attached to the block. Two gaps are formed on it by using thick metal strips in order to make the Wheat stone's bridge. The terminal B between the gaps is used to connect galvanometer and jockey.
A resistance wire is introduced in gap $ and the resistance box is in gap R. One end of the galvanometer is connected to terminal D and its other end is connected to a jockey. As the jockey slides over the wire AC, it shows zero deflection at the balancing point (null point).
If the length AB is 2,then the length BC is ( 100-L). Then, according to Wheatstone's principle;
X/R =L/(100-L)
Now, the unknown resistance can be calculated as,
X = R(L/100-L)
(100 %)
The specific resistance or resistivity of the material of the wire can be then calculated by using the relation,
Row (p) = πr²/L
Where L be the length of the wire and r be its radius.
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