Question

a conducting wire with conductance of 0.9s what is the conductivity of another wire of the same material and of the same length but the radius of its cross section is 3 times the radius of the cross section of the first wire

Answer 1

originlal wire :

conductance = 0.9

conductivity = n

length = l

area = A

New wire -

conductance = ?

conductivity = n

length = l

area = 3A

Conductance of original wire :

C = (nA)/l = 0.9 s

new conductance :

C' = (n3A)/l = 3× (nA)/l = 3 × 0.9 = 2.7 s