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Electricity — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceElectricity1 Mark
MCQ
What is the minimum resistance which can be made using five resistors each of $\frac{1}{5}\Omega$.
  • A
    $\frac{1}{5\Omega}$
  • ✓
    $\frac{1}{25\Omega}$
  • C
    $\frac{1}{10\Omega}$
  • D
    $25\Omega$
✓

Answer

Correct option: B.
$\frac{1}{25\Omega}$
Put them all in parallel $-$
$\frac{1}{\text{R}} = 1\frac{1}{5} + 1\frac{1}{5} + 1\frac{1}{5} + 1\frac{1}{5} + 1\frac{1}{5}$
$= 5 + 5 + 5 + 5 + 5 = 25 $
$\text{R} = \frac{1}{25}\text{Omhs}$

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