Question

The resistance of a wire is R ohm. What will be it's new resistance if it is stretched to n times its original length? (with explaination )​

Answer 1

Explanation:

hope this helps you better

Answer 2

Explanation:

R 1 = ρl 1 /A2

R 2 = ρl 2/A2

= ρn 2 l 1/A1

l 1A 1 =l2A 2→ (volume constant)l 1

A 1=nl 1 A 2

A 2 = A 1/n

Hence R 2 =n² R 1