PHYSICS
JAMB 2014 - Question 37
Physics 2014 JAMB Past Questions - Question 37: If a metal wire 4m long and cross sectional area 0.8mm² has a resistance of 60.find the resistivity of the wire .
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
B
Explanation
Resistivity, p = RA/t=6x0.8x10-6 = 1.2x10-6 Ω To find the resistivity of the wire, we can use the formula:
Resistance (R) = (Resistivity (ρ) * Length (L)) / Cross-sectional Area (A)
Given:
Resistance (R) = 6 Ω
Length (L) = 4 m
Cross-sectional Area (A) = 0.8 mm² = 0.8 × 10^(-6) m²
Substituting these values into the formula, we can solve for the resistivity (ρ):
6 Ω = (ρ * 4 m) / (0.8 × 10^(-6) m²)
Rearranging the equation, we get:
ρ = (6 Ω * 0.8 × 10^(-6) m²) / 4 m
Simplifying the expression, we find:
ρ = 1.2 × 10^(-6) Ω·m²
Therefore, the resistivity of the wire is 1.2 × 10^(-6) Ω·m².
Frequently Asked Questions
Examkits is a JAMB CBT practice platform that provides over 20 years of past questions, Post UTME questions, and detailed video solutions to help students prepare for their exams.
You can practice JAMB past questions online, on Android, or on a desktop using the Examkits app. Just register on our website and choose your preferred device.
Yes. Our Android and Windows versions support offline usage. Once downloaded and activated, no internet is required to use most of the features.
Yes, Examkits provides detailed video explanations for all JAMB past questions from 2000 to 2024, helping students understand how to solve each problem.
Examkits offers free practice for some subjects. However, full access requires a one-time affordable activation fee for each version of the app.