- Messages
- 933
- Reaction score
- 2,273
- Points
- 253
Because we are working with the same volume of that conducting putty, an increase in c.s.a will bring a decrease in the length by the same factor as the c.s.a ( Volume of cylinder=pie r square * length/height)
So hopefully u would be knowing that doubling the diameter would increase the c.s.a by 4 times {That if the diameter of 5 gives u an area of 25, then a diameter of 10 will give u an area value of 25*4}
the length will then decrease 4 times of the original value
So by the formula u can work out or otherwise that there will be an…
R=l/4 / 4A
R=l/4*1/4A
R=l/16A
… over all decrease in resistance by a factor of 16.
