Question

10.A cylindrical copper rod has resistance R. It is reformed to twice its original length
with no change of volume. Its new resistance is:
a R.
b. 2R
C. 4R
d. 8R
e. R/2​

Answer 1

Answer:

I think that but I am 99%sure (B. 2R)....

. I hope it is right

Answer 2

Answer:

No the correct answer is 4R.

Explanation: