question_answer

If \[400\Omega \]of resistance is made by adding four \[100\Omega \] resistances of tolerance 5%, then the tolerance of the combination is: [AIEEE 11-05-2011]

A) 5%

B) 10 %              

C) 15 %

D) 20 %

Correct Answer: A

Solution :

[a]

\[R=100\pm 5\]

\[4R=400\pm 20\]

Tolerance of combination is also 5%.