Question

A wire of resistance x ohm is drawn out, so that
its length is increased to twice its original length
and its new resistance becomes 20 ohm
then x will be
1)50 ohm
2)10 ohm
3)15 ohm
4)20 ohm

ans will explanation plz​

Answer 1

Answer:

2) 10 ohm

Explanation:

Length is directly proportional resistance

so you can make it

L1/L2=R1/R2