Question

a wire is stretched to triple its length What will be its resistance calculate good ans will be marked as BRAINLIEST

Answer 1

if wire is stretched triple it's length then the resistance would be increased

coz resistance is inversely proportional to cross sectional area

Answer 2

The change in resistance can be easily calculated by applying the following formula:

                                      $R=q*l/A$

Where

                                            q=Resistivity

                                             l=lenght

                                            A=cross sectional area

When the wire is stretched to 3 times its original length, its cross section is also reduced to one third of what it was before. By using the above relation, we find the new resistance to be 3x3= 9 times of what it was before!

Hope this helps.