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Q.

The resistance of metal is given by V=IR. The voltage in the resistance is V=(8±0.5) V and current in the resistance is I=(2±0.2)A, the value of resistance with its percentage error is

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a

(4±16.25%)Ω

b

(4±2.5%)Ω

c

(4±0.04%)Ω

d

(4±1%)Ω

answer is A.

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Detailed Solution

R=VI; 100×ΔRR=ΔVV+ΔII×100 Resistance =R±ΔRR×100
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