To Verify the Laws of Combination (Parallel) of Resistances Using a Metre Bridge Viva Questions

Metre Bridge, commonly known as the slide wire bridge, is a device that works on the balanced Wheatstone bridge principle.

• A meter bridge is constructed by using a 1 m wire with a uniform cross-sectional area stretched tightly and clamped between two thick metallic strips bent at right angles with two gaps to connect resistors across. 
• A key is used for connecting the clamped endpoints of the wire to a cell. 
• A galvanometer is attached to the metallic strip halfway between the two gaps at one end. 
• The galvanometer's opposite end is attached to a jockey, which travels along the wire to form an electrical connection.
• A standard known resistance R is connected across one of the gaps. An unknown resistance S is connected across the opposite gap.

The meter bridge works on the principle of the Wheatstone Bridge. At balance condition:

\(S= (\frac{100-l}{l})R\)

The sensitivity of the meter bridge is maximum when the resistances of all the arms of the bridge are almost the same.

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Ques. What is resistance?

Ans. The electrical resistance of a conductor is defined as the opposition to the flow of an electric current through that conductor.

Ques. What is a parallel combination of resistors?

Ans. Two or more resistors are said to be connected in parallel if one end of all the resistors is connected to one terminal and the other end of all the resistors is connected to other terminals such that the potential difference across each resistor is equal to the applied potential difference across the combination.

Ques. What is meant by an equivalent resistor?

Ans. An equivalent resistor is a single resistor that draws the same current as the provided combination of resistors when the same potential difference is applied across its endpoints.

Ques. What are some of the advantages of using a meter bridge to measure resistance?

Ans. Some of the advantages of using a meter bridge to measure resistance include:

• It is a simple and straightforward instrument to use.
• It is relatively inexpensive.
• It is accurate and reliable.

Ques. What is a series combination of resistors?

Ans. Two or more resistors are connected to be in series if they are connected one after the other such that the same current flows through all the resistors when the same potential difference is applied across the combination.

Ques. What is the formula for equivalent resistance for the series combination of resistors?

Ans. Let R₁, R₂, R₃,.... be resistances of n resistors connected in series, then the equivalent resistance of the combination is given by

R = R₁ + R₂ + R₃ +........+ R_n

Ques.What is the formula for equivalent resistance for the parallel combination of resistors?

Ans. Let R₁, R₂, R₃,.... be resistances of n resistors connected in parallel, then the equivalent resistance of the combination is given by

1/R = 1/R₁ + 1/R₂ + 1/R₃ +........+ 1/R_n

Ques. What is a meter bridge?

Ans. A meter wire bridge, also referred to as a slide wire bridge, is a device that works on the principle of Wheatstone Bridge. A meter bridge is used to determine the unknown resistance of a conductor.

Ques. What is the use of a meter bridge?

Ans. A meter bridge is used to precisely measure the resistance of an unknown resistor.

Ques. Which material wire is used in a meter bridge?

Ans. Materials like nichrome, constantan, or manganin are used to make the wire of a meter bridge because they have a high resistance value and a low coefficient of temperature resistance.

Ques. What are the main parts of a meter bridge?

Ans. The main parts of a meter bridge are:

• A long wire of uniform cross-sectional area
• Two thick metallic strips bent at right angles with two gaps across which resistors are to be connected
• A cell
• A key
• A galvanometer
• A jockey

Ques. What is Wheatstone Bridge?

Ans. A Wheatstone bridge is a type of electrical circuit that is used to measure the unknown electrical resistance of a circuit by balancing its two arms, where the unknown component is one of its arms.

Ques. What is the balanced condition of a Wheatstone bridge?

Ans. The Wheatstone bridge is said to be balanced when no current passes through the galvanometer. This condition can be produced by changing the known resistance and variable resistance.

Ques. What is the working principle of a Wheatstone bridge?

Ans. The principle of null deflection is responsible for the workings of a Wheatstone bridge, which means that no current flows through the circuit and the resistance ratios are equal.

Ques. How does temperature affect the resistance of a conductor?

Ans. The resistance of a conductor is proportional to its temperature. The resistance of the conductor increases as the temperature rises.

Ques. What is the case when the meter bridge is in a more sensitive condition?

Ans. When all four resistors have the same resistance value, the meter bridge circuit is highly sensitive.

Ques. What is the principle of the meter bridge?

Ans. The meter bridge is based on the principle of the Wheatstone bridge, which states that when a balanced circuit is formed, there is no current flow through the galvanometer.

Ques. What are the restrictions of Wheatstone Bridge?

Ans. The resistance of the leads and contacts becomes essential for measuring low resistance, however, the Wheatstone bridge shows errors while measuring them.

Ques. What is a zero error in a meter bridge?

Ans. A zero error in a meter bridge is an error in the reading of the meter bridge that is caused by the jaws of the jockey not being perfectly aligned when the jaws are closed.

Ques. What is Ohm’s law?

Ans. Ohm's law states that the current (I) flowing through a conductor is directly proportional to the potential difference (V) and inversely proportional to the circuit resistance.

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