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AIIMS2019PhysicsMathematics in Physics

A potential difference V=100 5 ~V , when applied across a resistance, gives a current I=10 0.2 ~A . What is the percentage error in R ?

Options

  1. A2 %
  2. B5 %
  3. C7 %
  4. D8 %

Correct answer

C. 7 %

Step-by-step solution

Potential difference is V=100 5 ~V Current is I=10 0.2 ~A . Percentage error in voltage is obtained as V V = 5 100 100 %=5 % Percentage error in current is obtained as I I = 0.2 10 100 %=2 % Using, R= V I , the percentage error in resistance is calculated as R=5 %+2 %=7 % .

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