Copper wire is not used as the bridge wire in a meter bridge because

Why a meter bridge is used?

KCl is used in salt bridge because:

Assertion: A slide wire bridge is also called a metrebridge. Reason: It is because, the length of wire in a slide wire bridge is one metre.

Assertion: A slide wire bridge is also called a metrebridge. Reason: It is because, the length of wire in a slide wire bridge is one metre.

Why is a slide wire bridge also called a metre bridge?