JEE Main 2026 · 5 Apr · Shift 2 · Physics Q27

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PhysicsSingle correct+4 / -1Question 27 of 75

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

0.25

2.5

0.18

Answer and worked solution

Official answer: D

Resistance. $R=\dfrac{10}5=2$ Ω.

Fractional error.
$\frac{\Delta R}R=\frac{0.5}{10}+\frac{0.2}5=0.09.$

Error: $\Delta R=0.09\times2=0.18$ Ω.

(D)

Topics:Errors in measurement

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JEE Main 2026 · 5 Apr · Shift 2, Physics question 27