JEE Main 2026 Physics question
In an experiment to determine the resistance of a given wire using Ohm's law, the voltmeter and ammeter readings are noted as 10 V and 5 A, respectively. The least counts of voltmeter and ammeter are 500 mV and 200 mA, respectively. The estimated error in the resistance measurement is Ω.
Answer: (D)
Solution
R=10/5=2Ω. ΔR/R=ΔV/V+ΔI/I=0.5/10+0.2/5=0.05+0.04=0.09. ΔR=0.09×2=0.18Ω.