What precautions have you taken to perform Carey foster experiment?

What precautions have you taken to perform Carey foster experiment?

Precautions: 1) All the connections are to be made tightly. 2) Allow the current to flow through the circuit on when the readings are to be taken. 3) Jockey should not be dragged on the wire, it should be lifted and made in contact with the wire.

What is the principle of Carey foster bridge?

The Carey foster bridge principle is simple and similar to Wheatstone’s bridge working principle. It works on the principle of null detection. That means the ratios of the resistances will be equal and the galvanometer records zero where there is no current flow.

What is the advantage of Carey foster’s bridge over the meter bridge?

Carey Foster Bridge Advantages The Carey Foster bridge is a modified form of the meter bridge in which the effective length of the wire is considerably increased by connecting a resistance in series with each end of the wire. This increases the accuracy of the bridge.

Why is Carey foster’s bridge called a modified form of Wheatstone bridge?

Carey Foster bridge is basically used to calculate the difference between the resistance of two elements. It was invented by scientist Carey Foster in the year 1872. The same concept is used in Carey Foster bridge with small modifications.

What is Carey Foster’s bridge?

The Carey Foster’s bridge is an electrical circuit that can be used to measure very small resistances. It works on the same principle as Wheatstone’s bridge, which consists of four resistances, P, Q,R and S that are connected to each other as shown in the circuit diagram in Figure 1.

What will happen if jockey is pressed too hard?

Ans. If jockey is pressed too hard, the wire will become flat at that point and its are of cross-section will be no longer uniform and hence the resistance of the wire will not be proportional to its length. What will happen if the two resistances in the inner gaps are not equal?

How do you connect a galvanometer to a jockey J?

Connect the thick copper strip X in the gap 1 and the fractional resistance box by means of thick copper rods in gap 4. Connect one terminal of the Galvanometer to the central terminal of the Galvanometer to the central terminal B and the other to a Jockey J. Connect the cell through a key K between the points A and C.