A certain volume of copper is drawn into a wire of radius a and is wrapped in shape of a helix
Channel: Doubtnut
Date: 20/02/2020

A certain volume of copper is drawn into a wire of radius a and is wrapped in shape of a helix having radius `r ( gt gt a)`. The windings are as close as possible without overlapping. Self inductance of the inductor so obtained is `L_(1)`. Another wire of radius 2 a is drawn using same volume of copper and wound in the fashion as described above. This time the inductance is `L_(2)`. Find `(L_(1))/(L_(2))`