A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm2 is joined with a similar Aluminium (Al) rod as shown in figure. Find the resistance of the combination between the ends A and B.(Take Resistivity of Copper = 1.7 $\times$ 10$-$8 $\Omega$m and Resistivity of Aluminium = 2.6 $\times$ 10$-$8 $\Omega$m)

Question

A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm² is joined with a similar Aluminium (Al) rod as shown in figure. Find the resistance of the combination between the ends A and B.

(Take Resistivity of Copper = 1.7 $\times$ 10^$-$8 $\Omega$m and Resistivity of Aluminium = 2.6 $\times$ 10^$-$8 $\Omega$m)

0.0858 m$\Omega$

1.420 m$\Omega$

0.858 m$\Omega$

2.170 m$\Omega$

Solution

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