Why is the key is pressed before the key k1?

To locate null point, deflection battery key K_(1) is pressed before the galvanometer key K_(2). So, due to self induction ,a large back emf is generated in the galvanometer, which mwy damage the galvanometer.

What happens to the balanced point if the position of the cell and the galvanometer are interchanged in Wheatstone bridge?

Explanation: If position of the cell and galvanometer are interchanged no current will pass from galvanometers again. Therefore balance point remains unchanged.

What is the purpose of using Wheatstone bridge in this experiment?

Significance. The Wheatstone bridge illustrates the concept of a difference measurement, which can be extremely accurate. Variations on the Wheatstone bridge can be used to measure capacitance, inductance, impedance and other quantities, such as the amount of combustible gases in a sample, with an explosimeter.

What is the basic principle of a Wheatstone bridge?

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

Why do you press battery key first and then galvanometer key?

Answer: If the galvanometer key pressed first, then due to self induction , a current will be induced which is likely to damage the galvanometer. Therefore, to avoid the induction effects, we first press the cell key.

Which key is pressed first in Wheatstone bridge?

In Wheatstone bridge, initially a cell key and later on galvanometer key is pressed. If the galvanometer’s key is pressed first then the induced current flow in the coil reduce the main current.

What happens to the balance point if the position of the cell?

Complete answer: If the galvanometer and cell are interchanged at the balance point of the bridge The balance point remains unaltered if the galvanometer and the cell are swapped. As a result, the galvanometer will display no current and the deflection will be zero.

How will be balancing point be affected if the positions of the battery and galvanometer are interchanged in a Metre bridge experiment give reason for your answer?

(c) If the galvanometer and cell are interchanged, the position of the balance point remains unchanged. Hence, the galvanometer will show no current.

What is a bridge circuit used for?

In power supply design, a bridge circuit or bridge rectifier is an arrangement of diodes or similar devices used to rectify an electric current, i.e. to convert it from an unknown or alternating polarity to a direct current of known polarity.

Why is Wheatstone bridge so called?

Wheatstone bridge is an electric circuit and as the name suggests, it is in a shape of a bridge, the bridge is a galvanometer. It is named after Sir Charles Wheatstone who has popularized this. Wheatstone bridge helps in finding the unknown resistance value of a resistor. This bridge is also called post office box.

What is Wheatstone bridge and explain?

Definition of Wheatstone bridge : an electrical bridge consisting of two branches of a parallel circuit joined by a galvanometer and used for determining the value of an unknown resistance in one of the branches.

What is the principle of Wheatstone bridge?

The Wheatstone bridge works on the principle of null deflection, i.e. the ratio of their resistances are equal and no current flows through the circuit. When is the Wheatstone Bridge balanced?

What happens to the balance point when cell and galvanometer are interchanged?

If in the experiment of Wheatstone’s bridge, the positions of cells and galvanometer are interchanged, then balance point will If we interchange the cell and galvanometer then circuit becomes as shown in figure b. Thus, balanced point remains unchanged.

How do you calculate unknown resistance in a Wheatstone bridge?

Wheatstone bridge, also known as the resistance bridge, calculates the unknown resistance by balancing two legs of the bridge circuit. One leg includes the component of unknown resistance. What is the Wheatstone Bridge Principle?

What is the voltage across points C-D in the Wheatstone bridge?

The voltage across points C-D is given as: The value of resistor, R 4 required to balance the bridge is given as: We have seen above that the Wheatstone Bridge has two input terminals (A-B) and two output terminals (C-D). When the bridge is balanced, the voltage across the output terminals is 0 volts.