The resistance of a metal is given by R = V/I, where V is potential difference and I is the current. In a circuit, the potential difference across resistance is V= (8 ± 0.5) V and current in resistance, I = (4 ± 0.2) A. What is the value of resistance with its percentage error?

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(2±5.6%) Ω

(2±0.7%) Ω

(2±35%) Ω

(2±11.25%) Ω

answer is D.

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Detailed Solution

R=VI=84=2 ΩΔRR×100=ΔVV×100+ΔII×100=0.58×100+0.24×100=11.25%⇒R=(2±11.25%) Ω

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