Question 618: Current Electricity

Question

The given circuit shows a uniform straight wire $$A B$$ of $$40 \mathrm{~cm}$$ length fixed at both ends. In order to get zero reading in the galvanometer $$G$$, the free end of $$J$$ is to be placed from $$B$$ at:

Accepted Answer

$$\begin{aligned}
& \frac{8}{x}=\frac{12}{40-x} \
& \frac{2}{x}=\frac{3}{40-x} \
& 80-2 x=3 x \
& 16=x
\end{aligned}$$
from $$B$$
$$=40-16=24 \mathrm{~cm}$$

Answer

32 cm

Answer

8 cm

Answer

16 cm

Answer

24 cm

Current Electricity

The given circuit shows a uniform straight wire $A B of 40 \mathrm{~cm} length fixed at both ends. In order to get zero reading in the galvanometer G, the free end of J is to be placed from B$ at:

Choose the correct answer: