Question

Write the principle of working of a meter bridge.

Answer 1

$l_1+l_2=L$

Meter bridge is constructed on the principle based on balanced wheat stone bridge

Jockey $J$ moved along the slide wire $AB$ and there will onw position where galvanometer show no current.

Now the meter bridge is balanced

Balancing condition is

$\frac{R}{l_1}=\frac{S}{l_2}$