The resistance of a pieces of wire of lenght 20m are crossed-sectional area 8 x 10 6m2is?
[Resistivity of the wire = 4 x 10-7 Ω m]
[Resistivity of the wire = 4 x 10-7 Ω m]
-
A.
5.0 Ω -
B.
0.5 Ω -
C.
10.0 Ω -
D.
1.0 Ω
Correct Answer: Option D
Explanation
since resistance R = p (l)/a
= (4 x 10-7 x 20)/8.0 x 10-6
R = 1.0 Ω