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Resistance of a conductor from its resistivity and dimensions

This type of question, asked 3 times: 24 Jan 2023, 25 Jan 2023, 10 Apr 2023. All 3 questions below, oldest first.

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  1. Question 1

    24 Jan 2023

    23
    A hollow cylindrical conductor has length of 3.14 m3.14\text{ }m, while its inner and outer diameters are 4 mm4\text{ }mm and 8 mm8\text{ }mm respectively. The resistance of the conductor is n×10−3Ωn \times10^{- 3}\Omega. If the resistivity of the material is 2.4×10−8Ωm2.4 \times10^{- 8}\Omega m. The value of nn is

  2. Question 2

    25 Jan 2023

    9
    A uniform metallic wire carries a current 2 A2\text{ }A, when 3.4 V3.4\text{ }V battery is connected across it. The mass of uniform metallic wires is 8.92×10−3 kg8.92 \times10^{- 3}\text{ }kg density is 8.92×103 kg/m38.92 \times10^{3}\text{ }kg/m^{3} and resistivity is 1.7×10−8Ω−m1.7 \times10^{- 8}\Omega - m. The length of wire is:

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  3. Question 3

    10 Apr 2023

    117
    A rectangular parallelopiped is measured as 1 cm×1 cm×100 cm1\text{ }cm \times 1\text{ }cm \times 100\text{ }cm. If its specific resistance is 3×10−7Ωm3 \times10^{- 7}\Omega m, then the resistance between its two opposite rectangular faces will be___ ×10−7Ω\times 10^{- 7}\Omega.