Answer:
R = 0.106micro ohms
Explanation:
For a given shape, the resistance depends on the material of which the object is composed. Different materials offer different resistance to the flow of charge. We define the resistivityρ of a substance so that the resistance R of an object is directly proportional to ρ. Resistivity ρ is an intrinsic property of a material, independent of its shape or size. The resistance R of a uniform cylinder of length L, of cross-sectional area A, and made of a material with resistivity ρ, is
R
=
ρ
L
A
The dimension of the Bar is LxBxH
L= 2cm = 0.02m, B = 5cm = 0.05m, H = 10cm = 0.10m.
the Area, A = BxH = 0.05 x 0.1 =0.005m2.
the resistivity of Aluminum, p = 2.65x10-8
the resistance of the aluminum is
R = p xL/A = 2.65x10-8 x 0.02/0.005
= 0.000000106ohms
= 0.106micro ohms
