• question_answer What are the dimensions of electrical resistance? A) $M{{L}^{2}}{{T}^{-2}}{{A}^{2}}$   B)   $M{{L}^{2}}{{T}^{-2}}{{A}^{-2}}$  C)   $M{{L}^{2}}{{T}^{-2}}{{A}^{2}}$   D)   $M{{L}^{2}}{{T}^{-2}}{{A}^{-2}}$

From Ohm's law, resistance R is given by $\text{R}\,\text{=}\,\frac{\text{Potential}\,\text{Difference}}{\text{Current}}$ $\therefore$ Dimensions of $R=\frac{M{{L}^{2}}{{T}^{-3}}{{A}^{-1}}}{A}=M{{L}^{2}}{{T}^{-3}}{{A}^{-2}}$ Hence, the correction option is (b).