Question

A wire resistence r1 is cut into five equal pices these five pices of wire are then connected in parallel if the resultant resistance of this combination be r2,then the ratio r1/r2 is

Answer 1

If the resistance wire is cut into five pieces, the resistance of each wire is R/5. If we connect the pieces in parallel, we will get the net resistance as R/25. Therefore, the ratio will be 25.