Question

If potential and current are $V=(100\pm 0.5)$ volt and $I=(10\pm 0.2)A$ respectively, then value of resistance will be

• A. $(10\pm 0.7)\Omega$
• B. $(5\pm 2)\Omega$
• C. $(0.1\pm 2)\Omega$
• D. None of these

Answer 1

Answer: (A)

Maximum error $=0.5+0.2=0.7$
$\begin{array}{rl}\therefore R& =\frac{V}{I}\pm \text{ error }=\frac{100}{10}\pm 0.7\\ =& (10\pm 0.7)\Omega \end{array}$