Question

8. A cylindrical rod is reformed to twice its length with
To change in its volume. If the resistance of the rod
was R, the new resistance will be
(a) R
(b) 2R
(c) 4R
(d) 8R​

Answer 1

Answer:

R is directly proportional to length provided that temperature and surface area remains constant . → The new resistance will be same as integral increase in length of the conductor . →The new resistance = 2R

Explanation:

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