Which material is used for the meter bridge and why?
Jessica Wood general
The material of wire used in meter bridge is made of manganin or eureka due to there high specific resistance or resistivity. Thick copper strips are used in meter bridge because copper is a good conductor of electricity.
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Also, what is the use of meter bridge?
A meter bridge also called a slide wire bridge is an instrument that works on the principle of a Wheatstone bridge. A meter bridge is used in finding the unknown resistance of a conductor as that of in a Wheatstone bridge.
Additionally, which wire is used in potentiometer? Constantan and Manganin are generally used in potentiometer wires.. Constantan is a copper-nickel alloy usually consisting of 55% copper and 45% nickel. Its main feature is its resistivity which is constant over a wide range of temperatures.
Likewise, why thick copper wire is used in meter bridge?
(a) The connections between the resistors in a meter bridge are made of thick copper strips because the resistivity of the copper wire is very low. As, the connections are thick, so the area become very large and the resistance of eh wires become almost negligible.
Why is it called a meter bridge?
A meter bridge works on the principle of Wheatstone's network and is known as Wheatstone's meterbridge. The length of the wire used is one meter, so it is called meterbridge.
Related Question Answers
What is meant by meter bridge?
Meter bridge is a wheatstone bridge in which one lateral pair of resistances is replaced by a straight wire of length 1m of uniform cross section. And other pair consist of one known and one unknown resistance.What is null point in meter bridge?
A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component.null point is achieved by balancing potential drops in a circuit.What is the function of galvanometer?
Galvanometer, instrument for measuring a small electrical current or a function of the current by deflection of a moving coil. The deflection is a mechanical rotation derived from forces resulting from the current.Who invented Metre bridge?
Out of the two, one of the legs is an unknown component which was invented by Samuel Hunter Christie in the year 1833 and later, it improved and popularized by Sir Charles Wheatstone in the year 1843.What is end error in meter bridge?
The shifting of zero of the scale at different points as well as the stray resistance give rise to the end error in meter bridge wire. This error arise due to the non uniformity of the meter wire End corrections can be estimated by including known resistances P1 and Q1 in the two ends and finding the null point. 3.6.How can we increase sensitivity of meter bridge?
The sensitivity of the meter bridge is at the peak when all resistors have the same order. It can be increased by making sure that the current in the galvanometer is very high. This can in turn be done by lessening the values of the resistors that are used in the instrument.Can we use copper wire instead of Nichrome in meter bridge?
Copper being a good conductor of electricity, it will not offer any resistance to the flow of electricity. On the other hand, when a nichrome coil is used, its resistance being very high compared to copper, the current passed gets converted into the heat.What is the difference between resistance and resistivity?
The resistance is the ratio of the length and cross-section area of the conductor, whereas the resistivity of the material is the ratio of the product of the resistance and area to the length of the conductor. The resistance is represented by the symbol R whereas the resistivity is represented by the symbol ρ.What is Metre bridge principle?
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. As the jockey slides over the wire AC, it shows zero deflection at the balancing point (null point). If the length AB is , then the length BC is ( 100-l ).Why do we use thick connecting wires?
1 Answer. The resistance of connecting wires should be almost negligible. For this thick wires are used . since a thicker wire has a small resistance and the wires are made of copper because the resistivity of copper is low.What is meant by specific resistance?
Specific resistance is defined as the resistance offered per unit length and unit cross-sectional area when the known amount of voltage is applied.What is the resistivity of constantan?
Constantan alloyIts resistivity (4.9 x 10−7 Ω·m) is high enough to achieve suitable resistance values in even very small grids, and its temperature coefficient of resistance is fairly low. Constantan is also used for electrical resistance heating and thermocouples.Why should the meter bridge wire have uniform thickness?
Ans: Thick Cu strips have less resistance and minimise effect of end resistance. Why should the bridge wire have uniform thickness and material density throughout? Ans: Because only then, the resistance per unit length will be same throughout.What are end resistances?
The thick copper strips at the two ends of the wire offer some resistances. These resistances at the ends are called end resistances.Why should we get the null point in the middle of the meter bridge wire?
The null point should be obtained preferably at the middle one-third portion of the wire of meterbridge so as to get maximum accuracy. In this case the ratio arms are nearly equal and the end resistances of copper strips also produce the least effect.What is balancing length in meter bridge?
In a metre bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 c m 20 cm 20 cm. The value of the unknown resistance is. A .What happens if the galvanometer and cell are interchanged?
Answer : When the galvanometer and cell are interchanged at balance point of bridge then no current would flow through galvanometer because of no deflection.How do you find the resistance of a wire using a meter bridge?
Procedure- Cut the resistance wire at the point where it leaves the terminal , started it & find its length by using a meter scale .
- Measure the diameter of the wire at least at 4 places in two mutually perpendicular direction at each place with the of screw gauge .
- Record your observation as given in the table .
