Explain the construction of a meter bridge used in the laboratory.

(N/A) meter bridge consists of a wire of uniform cross-section and uniform resistivity with a length of $1 \ m$. This wire is stretched between two thick copper strips fixed on a wooden board.
The copper strips are $L$-shaped at the ends,providing terminals for connections. There is a central straight copper strip that provides a gap for connecting a galvanometer.
$A$ meter scale is fixed parallel to the wire to measure the balancing length.
$A$ battery,a key $(K_1)$,and a rheostat are connected in series between the two ends $A$ and $C$ of the wire to maintain a steady current.
$A$ galvanometer $(G)$ is connected between the central terminal $B$ and a jockey. The jockey can be moved along the wire to find the null point $D$ where the galvanometer shows zero deflection.