JAMB Physics 2007 Objective — Question 22
Question 22 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2007 Objective paper, with the correct answer and a full explanation.
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A conductor has a diameter of 1.00mm and length 2.00m. If the resistance of the material is 0.1 ohm, its resistivity is
- A. 3.93x10^-8 ohm.mCorrect
- B. 3.93x10^-6 ohm.m
- C. 2.55x10^-2 ohm.m
- D. 2.55x10^-6 ohm.m
Explanation
R = (resistivity x length)/Area. Area = pi.d2/4 = 7.855x10^-7 m2. Resistivity = (R x A)/l = (0.1 x 7.855x10^-7)/2 = 3.93x10^-8 ohm.m.
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