Question

the resistance of a
metallic wire of length 1.5 m is 0.3 ohms
if the radius is 0.2 mm, what is the
value of resistivity of the metal?​

Answer 1

HeRe Is Your Ans ⤵

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Area = πR²

Area = 22 /7 × (0.2)²

Area = 22 / 7 × 4 / 100

Area = 88 / 700

Area = 0.125714286 M²

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Resistivity = area × resistance /length

Resistivity = 0.125714286 × 0.3 / 1.5

Resistivity = 0.037714286 / 1.5

Resistivity = 0.025142857 ohm Mili Meter

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