A 40Ω resistor is to be wound from platinum wire 0.1mm in diameter.How much wire is needed ? Given ( ρ = 11×10⁻⁸ Ωm )

A 40 ohm resistor is to be wound from platinum wire 0.1mm in diameter.How much wire is needed ? Given (resistivity ρ = 11×10⁻⁸ Ωm )
Physics class 12 problem solution
Inter class physics problem solution