Teaching MPPSC Assistant Professor Mock Test Series 2025 Physics Current, Resistance and Electricity
A cylinder of length L is made up of an inner core of steel of radius r1 and an outer sheath of copper of thickness r1. The resistivities of steel and copper are ρ1 and ρ2 respectively. The total resistance of the cylinder is
1
\(\rm \frac{(\rho_1\rho_2)L}{\pi r_1^2(3\rho_1+\rho_2)}\)
2
\(\rm \frac{(3\rho_1+\rho_2)L}{\pi r_1^2}\)
3
\(\rm \frac{(\rho_1+\rho_2)L}{4\pi r_1^2}\)
4
Cannot be determined from the information provided above