Physics And Measurement Question 295

Question: The resistance of a metal is given by R=VI 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=(2±0.2)A . What is the value of resistance with its percentage error?

Options:

A) 4Ω±16.25

B) (4±0.7)Ω

C) 4Ω±0.7

D) 4Ω±7

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Actual R=82=4 % error in R =% error in V+% error in I =0.58×100

R=4Ω±16.25

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