Answer: 2.5 ± 0.1125 Ω.
- A 2.5 ± 0.05 Ω
- B 2.5 ± 0.15 Ω
- C 2.5 ± 0.025 Ω
- D 2.5 ± 0.1125 Ω
Correct answer: D. 2.5 ± 0.1125 Ω
Explanation: Relative error in R = (0.1/5.0) + (0.05/2.0) = 0.02 + 0.025 = 0.045, so absolute error = 0.045 × 2.5 = 0.1125 Ω.
The 7 SI base units. All derived units (newton, joule, watt, volt, etc.) can be expressed as combinations of these 7 fundamental units raised to various powers.
Concept context
SI base units, dimensional analysis, significant figures, and error propagation. The toolkit every physics calculation relies on.