Question 396: Current Electricity

Question

In the experiment to determine the galvanometer resistance by half-deflection method, the plot of $$1 / 	heta$$ vs the resistance (R) of the resistance box is shown in the figure. The figure of merit of the galvanometer is _________ $$	imes 10^{-1} \mathrm{~A} /$$ division. [The source has emf $$2 \mathrm{~V}$$]

Accepted Answer

$$\frac{1}{3} \mathrm{~A} \longrightarrow \frac{1}{2} \mathrm{div}$$
$$\frac{1}{2} \mathrm{~A} \longrightarrow \frac{2}{3} \mathrm{div}$$
$$	ext { Figure of merit }=\frac{\Delta i}{\Delta 	heta} \quad \begin{aligned}
& \frac{\frac{1}{2}--}{\frac{2}{3}-\frac{1}{2}} \
&=0.5 \
&=5 	imes 10^{-1} \mathrm{~A} / \mathrm{div}
\end{aligned}$$

Current Electricity

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