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1. units,dimensions and measurement — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics1. units,dimensions and measurement1 Mark
MCQ
Dimensional formula of resistivity is
  • A
    $\left[ {M{L^2}{A^{ - 2}}{T^{ - 3}}} \right]$
  • ✓
    $\left[ {M{L^3}{A^{ - 2}}{T^{ - 3}}} \right]$
  • C
    $\left[ {ML{A^{ - 2}}{T^{ - 3}}} \right]$
  • D
    $\left[ {M{L^3}{A^{ - 1}}{T^{ - 3}}} \right]$
✓

Answer

Correct option: B.
$\left[ {M{L^3}{A^{ - 2}}{T^{ - 3}}} \right]$
b
Resistivity $=\frac{\text { Resistance } \times \text { Area }}{\text { Length }}$

$=\frac{M L^{2} T^{-3} A^{-2} \times L^{2}}{L}=\left[M L^{3} T^{-3} A^{-2}\right]$

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