Neco 2020 Physics Question 23
Practice objective / multiple choice question 23 from the 2020 Neco Physics examination.
In an experiment to determine the resistivity of a copper wire, a student measures the length \(L = 1.200\,\text{m}\) with a ruler (least count \(1\,\text{mm}\)), the diameter \(d = 0.500\,\text{mm}\) with a micrometer (least count \(0.01\,\text{mm}\)), and the resistance \(R = 2.50\,\Omega\) with a digital multimeter (±0.5\% reading error). Assuming independent random errors and taking the absolute uncertainty as half the least count for each instrument, calculate the combined percentage uncertainty in the resistivity \(\rho = RA/L\). Identify the dominant source of uncertainty and suggest two experimental precautions to reduce it.
Answer Options
About This Question
This is Neco 2020 Physics Question 23. It is one of the objective questions from the 2020 Neco Physics examination.
Difficulty level: Hard .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.