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Two wires of the same dimensions but resistivities ${\rho _1}$ and ${\rho _2}$ are connected in series. The equivalent resistivity of the combination is
  • A${\rho _1} + {\rho _2}$
  • B$\frac{{{\rho _1} + {\rho _2}}}{2}$
  • C$\sqrt {{\rho _1}{\rho _2}} $
  • D$2({\rho _1} + {\rho _2})$
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