"A copper rod of 1 cm diameter and 8 cm length is drawn into a wire of uniform
Channel: Doubtnut
Date: 2020-04-05

"A copper rod
 of 1 cm diameter and 8 cm length is drawn into a wire of uniform diameter and
 18 m length. The radius (in cm) of the wire is,
`1/(15)`
(b) `1/(30)`
(c) `2/(15)`
(d) 15"