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A wire of length 15m made of a material of resistivity 1.8 x...

A wire of length 15m made of a material of resistivity 1.8 x 10^-6\(\Omega\)m has a resistance of 0.27\(\Omega\). Determine the area of the wire

A.

1.5 x 10^-4m²

B.

1.0 x 10^-4m²

C.

2.7 x 10^-5m²

D.

7.3 x 10^-6m²

View answer & explanation

Correct answer is B

Resistivity = \(\frac{\text {Resiatance x Area}}{length}\)

1.6 x 10^-6 = \(\frac{15 \times Area}{0.27}\)

Area = 1.0 x 10^-4m²

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