How do you find the unknown resistance in meter bridge?
Record the observations in a tabular form. Stretch the resistance wire to find its length using a metre scale. Using screw gauge measure the diameter of the wire at four different places keeping it in a mutually perpendicular direction. Record the observations in the table.
How will you determine the unknown resistance?
Each time you can calculate the unknown resistance using the formula:unknown resistance(a)=known resistance(b)*L/M. The value is found to be the same for all values of known resistance.
What is the principle of metre bridge how it is used to find the unknown resistance?
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 …
How does meter bridge measure resistance?
The meter bridge consists of a wire of 100 cm, a scale, one unknown Resistor, one known Resistor or a Resistance Box, a Galvanometer and a jockey. Calculate the length L2. Then by using the Wheatstone bridge principle we can find the unknown Resistance of the Meter Bridge.
Which method is used in Wheatstone meter bridge experiment to determine unknown resistance?
Complete answer: The Meter bridge is the modification of Wheatstone’s network used to determine the value of unknown resistance. The meter bridge consists of a thin, uniform, and homogenous conducting wire AC, rectangular wooden board between two thick L shaped metal strips C1 and C2 as shown in the diagram.
Why the meter bridge apparatus is called meter bridge?
The reason why this bridge is called the Meter Bridge is because of the fact that it works on the Wheatstone bridge’s principle. So, people also popularly call it Wheatstone’s meter bridge. Another thing is that the wire length used in this circuit is 1 meter, so it has got its name as a meter bridge.
How do you solve a meter bridge?
Calculation of an Unknown Resistance Using Meter Bridge:
- R / Resistance across length AB = S / Resistance across length BC.
- r= ρl / A.
- AB=ρl1 / A.
- BC=ρl2 / A.
- R / ρl1 / A = S / ρl2 / A.
- R / l1 = S / 100-l1
- S= (100–l1) R / l1
- ρ = πd2S / 4L.
What is working principle of metre bridge?
a) The principle of working of Metre bridge is wheat stone bridge principle and it is used to find the resistance of an unknown conductor or to compare two unknown resistance.
How do you use Wheatstone bridge to find unknown resistance?
Now, your bridge is in a balanced state, you can determine the value of unknown resistance by using the Wheatstone bridge formula. Multiply the value of the variable resistance by the ratio of the known resistances in the other two arms of the bridge. You have measured the unknown resistance using a Wheatstone bridge!
Why commutator is used in meter bridge?
The purpose of commutator in potentiometer experiment is (1) To protect the meter from the damage.
What is Wheatstone 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.
How does balancing length depends on resistance in metre bridge?
more or less that depends on the ratio of resistances used in the left and right gap of metre bridge. Potential gradient across the wire of metrebridge remains same in both the cases and hence there is no effect on the balancing length of wire. Thus, option (c ) is correct.
What are the two unknown resistance in a meter bridge?
In a meter bridge, there are two unknown resistance R and S. Find the ratio of R and S if the galvanometer shows a null deflection at 20 c m from one end? Ans: The null deflection in the galvanometer is obtained at 20 c m from one end.
How do you calculate the mean resistance of single unknown resistance?
Calculate Mean Resistance of Single Unknown Resistance = Total Sum of resistances of Unknown resistance from the above five readings)/5. Put your understanding of this concept to test by answering a few MCQs.
What is the principle of a meter bridge?
What is the Principle of a Meter Bridge? The principle of working of a meter bridge is the same as the principle of a Wheatstone bridge. A Wheatstone bridge is based on the principle of null deflection, i.e. when the ratio of resistances in the two arms is equal, no current will flow through the middle arm of the circuit.
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?