Question

Please solve the Problem.

Answer 1

(a) The electrical resistance of the wire is determined as 9.27 x 10⁻⁴ ohms.

(b) The current flowing through the wire is 1.1 mA.

Electrical resistance of the wire

The electrical resistance of the wire is determined as follows;

ρ = RA/l

RA = ρL

R = ρL/A

Where;

• A is area of the iron bar
• ρ is electrical resistivity = 1/conductivity = 1/1.0299 x 10⁷ = 9.7 x 10⁻⁸

A = πd²/4

A =  π x (0.02)²/4

A = 3.14 x 10⁻⁴ m²

R = (9.7 x 10⁻⁸ x 3)/(3.14 x 10⁻⁴)

R = 9.27 x 10⁻⁴ ohms

From the chart, voltage after 120 minutes ≈ 1.1 V

Current, I = V/R

where;

• R = 1 k-ohms = 1000 ohms

I = 1.1/(1000)

I = 1.1 mA

Learn more about resistance here: brainly.com/question/17563681

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