A 5.0 m long solid rod with circular cross-section has adiameter of 0.25 cm. Whe

Question

A 5.0 m long solid rod with circular cross-section has adiameter of 0.25 cm. When a voltage of 12.0 V is applied across it,685 A of current flows. a.) What is the resistivity of the material? b.) What is a possible identification of the material? A 5.0 m long solid rod with circular cross-section has adiameter of 0.25 cm. When a voltage of 12.0 V is applied across it,685 A of current flows. a.) What is the resistivity of the material? b.) What is a possible identification of the material? a.) What is the resistivity of the material? b.) What is a possible identification of the material?

Explanation / Answer

We know that :                Resistivity = R A / L Here   R =   V /I = 12.0/ 685 A = 0.0175          Area A = r2 = 3.14 * ( 0.00125 m )2                                   = 4.90 x 10-6 m2           = (  0.0175 *   4.90 x 10-6 ) / 5                  = 1.72 x 10-8   - m (b)          It iscopper Hope this helps u! Hope this helps u!

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