: What is the half deflection method?

Hint: To solve this question we have to know that, Take out the high obstruction (say \[2000\Omega \]) from the opposition box R and supplement the key \[{K_1}\]as it were. Change the worth of R so redirection is most extreme, even in number and inside the scale. Note the diversion. Leave it alone \[\theta \].

Complete step by step answer:
The half deflection technique is the strategy by which an inner opposition of a cell can help in assessing esteem which is considered as high. The diversion of half is considered as a worth acquired alongside the cell alone. In an avoidance strategy, a high opposition enclosure is associated with the battery to bring the diversion of the galvanometer inside the scale.

It is so on the grounds that the diversion is made half by utilizing a shunt obstruction S. Under what condition is the obstruction of a galvanometer ($E_1$) equivalent to shunt opposition (S)? \[{E_1} = S\], just when the arrangement opposition $R$ is high. To avoid the damage to the galvanometer we use high resistance in series with it.

Note: We know that the role of high resistance connected in series is to reduce the value of current in the circuit. Galvanometer will show full deflection when very large current flows. The value of series resistance must be much larger than the shunt resistance S. in the absence of resistance $R$. Since the galvanometer has small resistance , the current flowing through the circuit will be very high and full deflection may be shown in the galvanometer.