Can a meter bridge used to determine specific resistance?
To find resistance of a given wire using metre bridge and to determine the resistivity of its material. A metre bridge, also known as slide wire bridge is an instrument that works on the principle of Wheatstone bridge. It is used to determine the unknown resistance of a conductor.
Which condition is more sensitive to meter bridge?
The meter bridge circuit is most sensitive when all four resistors have similar resistance values.
What is the resistance of metre bridge?
The resistance of the meter bridge AB is given figure is 4 Ω. With a cell of emf ε=0. 5 V and rheostat resistance Rh=2 Ω the null point is obtained at some point J. When the cell is replaced by another one of emf ε=ε2 the same null point J is found for Rh=6 Ω.
What is a meter bridge used for?
A Meter bridge is used to calculate resistance values with high accuracy. They work on the principle of a balanced Wheatstone bridge.
How is a metre bridge used to find resistance of a given wire?
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 .
Why is the metre bridge method more optimal for measuring resistance as compared to Ohm’s law?
Metre bridge works on principle of wheat stone bridge. The Wheatstone bridgemethod is more accurate thanthe other methods ofmeasuring resistances because it uses null method. Hence the internal resistanceof the cell and resistance of galvanometer do not affect the null point.
What is the meaning of sensitivity of metre bridge?
Sensitivity of metre bridge is the accuracy to measure the value of current. bridge is most sensitive when all resistance are of same order.
What is the condition of maximum sensitivity?
The conditions for maximum sensitivity of a d.c. Wheatstone bridge are considered. One arm of the bridge is formed by a sensitive element. The maximum allowable power dissipation, or the current in the sensitive element, and the resistance of the detecting device are given.
What is the principle of metre bridge how it is used to find the unknown resistance?
Principle : Its working is based on the principle of Wheatstone bridge. When the bridge is balanced Measurement of unknown resistance by a metre bridge Working : After selecting a suitable resistance R from the resistance box the jockey is moved along the wire AC till there is no deflection in the galvanometer.
What is principle of working of metre bridge?
The meter bridge principle is based on the Wheatstone Bridge circuit which says that if at any point or length (of a wire), the ratio of two resistances (say R1 and R2) is equal to the ratio of another two resistances (say R3 and R4 where R4 is the unknown resistance), then there shall be no flow of current at that …
What is meter bridge How is the resistance measured by it?
The metre bridge, also known as the slide wire bridge consists of a onemetre long wire of uniform cross sectional area, fixed on a wooden block. The specific resistance or resistivity of the material of the wire can be then calculated by using the relation, ; Where L be the length of the wire and r be its radius.
How do you find the specific resistance?
Specific Resistance (”ρ”) is a property of any conductive material, a figure used to determine the end-to-end resistance of a conductor given length and area in this formula: R = ρl/A. Specific resistance for materials are given in units of Ω-cmil/ft or Ω-meters (metric).
How to find resistance of a given wire using metre bridge?
To find resistance of a given wire using metre bridge and hence determine the resistivity (specific resistance) of its material. Metre bridge apparatus is also known as a slide wire bridge. It is fixed on the wooden block and consists of a long wire with a uniform cross-sectional area.
What is a metre bridge?
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. A scale is attached to the block.
What are the components of a meter bridge?
The metre bridge consists of a known resistance R, an unknown resistance X, a one metre long constantan wire AB of uniform cross-sectional area, and a galvanometer G. One terminal of the galvanometer is connected to a jockey N.
Can a Wheatstone bridge be used to measure resistance?
The digital multimeters in today’s world provide the simplest forms in measuring the resistance. The Wheatstone Bridge can still be used in measuring light values of resistances around the range of milli-Ohms. How Is A Meter Bridge Used In Finding The Unknown Resistance?