Question

A meter bridge setup is shown in the figure. It is used to determine an unknown resistance $R$ using a given resistor of $15\Omega$. The galvanometer $\left(G\right)$ shows null deflection when tapping key is at $43cm$ mark from end $A$. If the end correction for end $A$ is $2cm$,then the determined value of $R$ will be $\Omega$

Answer 1

From balanced wheat stone bridge and adding the end correction
$\Rightarrow \frac{43+2}{15}=\frac{57}{R}$

$R=\frac{57\times 15}{45}=19\Omega$