What is half deflection method in galvanometer?

The half deflection method is the method by which an internal resistance of a cell can help in evaluating value which is considered as high. The deflection of half is considered as a value obtained along with the cell alone.

Why the method is called Half deflection method?

The quantity of current required to produce a deflection of one division in the galvanometer is called figure of merit of a galvanometer . Its unit is ampere per division . Why is this method called half deflection method ? It is so because the deflection is made half by using a shunt resistance S.

How do you find the resistance of a galvanometer by half deflection method?

Procedure

1. Make the connections accordingly as shown in circuit diagram.
2. See that all plugs of the resistance boxes are tight.
3. Take out the high resistance (say 2000 Ω) from the resistance box R and insert the key K1 only.
4. Adjust the value of R so that deflection is maximum, even in number and within the scale.

How to determine resistance of a galvanometer by half deflection?

Resistance of galvanometer by half deflection method Make the connections accordingly as shown in circuit diagram . Take out the high resistance (200 Ohm ) from the resistance box R and insert key K1 only . Adjust the value of R1 so that deflection is maximum , even in number and within the scale . Note the deflection .

Why is this method called half deflection method?

It is represented by K . Its unit is ampere per division . Why is this method called half deflection method ? It is so because the deflection is made half by using a shunt resistance S. Under what condition id the resistance of a galvanometer (E 1) equal to shunt resistance (S)? E1=S , only when series resistance R is very high .

How can current be detected from a galvanometer?

It can be detected from the deflection on galvanometer needle. The deflection is proportional to the current passed through it. Here, current will flows through th circuit when key k1 is closed and k2 is open. The current flowing through the galvanometer is proportional to the deflection in it.

What is the figure of Merit of a galvanometer?

The quantity of current required to produce a deflection of one division in the galvanometer is called figure of merit of a galvanometer . It is represented by K . Its unit is ampere per division .