MCQ
Two conductors of same length are connected in parallel as shown in figure. Their cross-sectional areas $A_1$ and $A_2$ and their resistivities are ${\rho _1}$ and ${\rho _2}$ respectively. The equivalent resistivity of this combination is
- A$\frac{{{\rho _1}{\rho _2}\left( {{A_1} - {A_2}} \right)}}{{{A_1}{\rho _2} + {A_2}{\rho _1}}}$
- B$\frac{{{\rho _1}{\rho _2}\left( {{A_1} + {A_2}} \right)}}{{{A_1}{\rho _1} + {A_2}{\rho _2}}}$
- C$\frac{{{\rho _1}{\rho _2}\left( {{A_1} - {A_2}} \right)}}{{{A_1}{\rho _1} + {A_2}{\rho _2}}}$
- ✓$\frac{{{\rho _1}{\rho _2}\left( {{A_1} + {A_2}} \right)}}{{{A_1}{\rho _2} + {A_2}{\rho _1}}}$
