What is meter bridge in Physics 12?

Spread the love

A meter bridge consists of a wire of length 1 m and of uniform cross-sectional area stretched taut and clamped between two thick metallic strips bent at right angles with two gaps across which resistors are to be connected. The end points where the wire is clamped are connected to a cell through a key.

What is meter bridge and its principle?

A meter bridge is an electrical apparatus using which we can measure the value of unknown resistance. It is made using a metre long wire of uniform cross-section. This wire is either nichrome or manganin or constantan. The principle of working of a meter bridge is the same as the principle of a Wheatstone bridge.

What is meter bridge formula?

⇒X = R(lX100−lx) ∴ Hence the unknown resistance X can be determined by using the formula X = R(lX100−lx) . Note: Slide wire is known as a meter bridge.

Why it 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.

What is a Wheatstone bridge class 12?

A wheatstone bridge, also known as the resistance bridge, can be defined as an electrical circuit in which an unknown electrical resistance can be measured with the help of two different legs belonging to a bridge circuit. Wheatstone bridge calculates the unknown resistance by balancing two legs of the bridge circuit.

Which wire is used in Metre bridge?

In a metre bridge, wires of nichrome, manganin and constantan are used because it has high resistance and low-temperature coefficient of resistance.

What is the principle of bridge?

What is the Wheatstone Bridge Principle? The Wheatstone bridge works on the principle of null deflection, i.e. the ratio of their resistances is equal, and no current flows through the circuit. Under normal conditions, the bridge is in an unbalanced condition where current flows through the galvanometer.

What is a balance point in meter bridge?

A balance point in meter bridge is a point where the galvanometer shows zero/null deflection.

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.

What is the length of meter bridge wire?

In a meter bridge the length of the wire is 100cm.

Why galvanometer is used in metre bridge?

It is used to find the unknown Resistance of the Material. 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. For finding the unknown Resistance, connect everything as required.

What is the use of Wheatstone bridge?

The Wheatstone bridge is an electrical bridge circuit used to measure resistance. It consists of a common source of electrical current (such as a battery) and a galvanometer or a multimeter that connects two parallel branches, containing four resistors, three of which are known.

Who discovered metre bridge?

The meter bridge works on the principle of Wheatstone Bridge that is named after the scientist who came up with the concept, Sir Charles Wheatstone. In grade 12, the meter bridge practical is a particularly important physics laboratory experiment.

What are the advantages of meter bridge?

1. To find the unknown resistance very very accurately. directly with ammeter or voltmeter . so resistance offered by ammeter and voltmeter do not effect the readings .

What is the difference between meter bridge and Wheatstone bridge?

Hint: A meter bridge is an electrical apparatus that helps in determining the value of unknown resistance of a metal coil. Complete step by step answer: Meter Bridge works on the principle of the Wheatstone bridge. A Wheatstone bridge is an electrical network which is used to calculate the value of unknown resistance.

What is Wheatstone principle?

Wheatstone Bridge Principle It works on the principle of null deflection, which means the ratio of their resistances are equal and hence no current flows through the circuit. Under normal conditions, the bridge will be in the unbalanced condition where current flows through the galvanometer.

What is Kirchhoff’s law Wheatstone bridge?

QP=SR. This is the principle of Wheatstone bridge. Let the current i is divided into two parts i1 and i2 flowing through P, Q and R, S respectively. In the position of equilibrium, the galvanometer shows zero deflection, i.e. the potential of B and D will be equal.

Which metal is used in Wheatstone bridge?

Alloy NiChrome is very resistant to corrosion and it has a very high melting point around 1400∘Cwhich makes it highly popular in making meter bridge wire.

Which material is used for metre bridge?

Generally alloys maganin/ constantan/ nichrome/ eureka are used in Meter Bridge, because these materials have low temperature coefficient of resistivity.

Why copper strips are used in meter bridge?

Distance of jockey from end A at the balance point, l = 39.5 cm. Thick copper strips helps to minimise resistance of the connections and hence they are used.

Why copper is not used in meter bridge?

Thus, copper, due to its low resistance and high temperature coefficient of resistance, cannot be used in meter bridges.

Why Leclanche cell used in meter bridge?

leclanche cell used for the experiment of meter bridge because it is so easy to mke it & EMF is grater than Daniel cell.

What is the formula of 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 a balance point?

The balance point of a data set is the point on a number line where the data distribution is balanced.

How do you connect a meter bridge?

Do NOT follow this link or you will be banned from the site!