If 18 meters of high-resistance wire with a diameter of 1.2 mm has a resistance of 10 ohms, what is the resistance of 27 m of the same type of wire with a diameter of 1.5 mm?

Question

irishboy123 · Answer

use $$R = \frac{\rho L}{A}$$

anonymous · Answer

ok?

irishboy123 · Answer

if rho (resistivity) is the same, then 
$$\left( \frac {RA}{L} \right)_1 = \left( \frac {RA}{L} \right)_2$$

radar · Answer

.  The resistance of the wire will vary directly with length and inversely with area.  In this case I would guess the resistance of the wire will increase but not by much