Physics

Problem

A composite resistor is made by joining two materials. Section 1 is a cylinder of radius

2\,\text{mm}

and length

10\,\text{cm}

with resistivity

\rho

. Section 2 is a cylinder of radius

1\,\text{mm}

and length

10\,\text{cm}

with resistivity

2\rho

. They are joined in series (end-to-end). A voltage

V

is applied across the combination. Compare the potential drop across Section 1 (

V_{1}

) versus Section 2 (

V_{2}