Question

The specific resistance of managing is 50 × 10 ^{− 8} ohm × m. The resistance of a cube of length 50 cm will be

1. 10 ^{− 6} ohm
2. 2.5 × 10 ^{− 5} ohm
3. 10 ^{− 8} ohm
4. 5 × 10 ^{− 4} ohm

Answer 1

Correct Answer - Option 1 : 10 ^{− 6} ohm
\(R\; = \;\frac{{\rho l}}{A}\; \Rightarrow \;50\; \times \;{10^{\; - \;8}}\; \times \;\frac{{50\; \times \;{{10}^{\; - \;2}}}}{{{{\left( {50\; \times \;{{10}^{\; - \;2}}} \right)}^2}}}\; = \;{10^{\; - \;6}}\;{\rm{\Omega }}\)