Why should the area of cross-section of the meter-bridge wire be uniform ? Explian

Why should the area of cross section of metre bridge wire be uniform?

The length and cross-section of the wire of meter bridge are

Why the meter bridge is called so?

Why meter bridge is called so ?

Why a meter bridge is used?

Does the current depend on the area of cross- section of the wire used.?

Assertion (A): The balancing point of a meter bridge is obtained at L = 40 cm. When the area of cross-section of the wire of is doubled, the balancing point shifts to L = 60 cm. Reason (R ): Resistance of wire is directly proportional to its area of cross-section.