Question

The resistance of a wire of length 250m is 1 ohm. if the resistivity of the material of wire is 1.6*10^-8 ohm metre, find the area of cross section of wire. how much does the resistance change if the diameter is doubled?

Answer 1

Answer:

Answer

R=ρ l/A

ρ= resistivity of wire

l= length

A= Area of cross − selection

1=1.6×10

−8

×

A

250

A=4×10

−6

m

2

.

Explanation:

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